65987505 has 12 divisors (see below), whose sum is σ = 114378420. Its totient is φ = 35193312.

The previous prime is 65987503. The next prime is 65987531. The reversal of 65987505 is 50578956.

65987505 is a `hidden beast` number, since 6 + 598 + 7 + 50 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 22268961 + 43718544 = 4719^2 + 6612^2 .

It is not a de Polignac number, because 65987505 - 2¹ = 65987503 is a prime.

It is a super-2 number, since 2×65987505² = 8708701632250050, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1466389 = 65987505 / (6 + 5 + 9 + 8 + 7 + 5 + 0 + 5).

It is not an unprimeable number, because it can be changed into a prime (65987503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 733150 + ... + 733239.

It is an arithmetic number, because the mean of its divisors is an integer number (9531535).

Almost surely, 2^65987505 is an apocalyptic number.

It is an amenable number.

65987505 is a deficient number, since it is larger than the sum of its proper divisors (48390915).

65987505 is a wasteful number, since it uses less digits than its factorization.

65987505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466400 (or 1466397 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The square root of 65987505 is about 8123.2693541455. The cubic root of 65987505 is about 404.0984977789.

The spelling of 65987505 in words is "sixty-five million, nine hundred eighty-seven thousand, five hundred five".