66087405 has 24 divisors (see below), whose sum is σ = 116992512. Its totient is φ = 34495584.

The previous prime is 66087403. The next prime is 66087409. The reversal of 66087405 is 50478066.

It is a happy number.

66087405 is a `hidden beast` number, since 6 + 608 + 7 + 40 + 5 = 666.

It is not a de Polignac number, because 66087405 - 2¹ = 66087403 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66087405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66087403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13509 + ... + 17738.

It is an arithmetic number, because the mean of its divisors is an integer number (4874688).

Almost surely, 2^66087405 is an apocalyptic number.

It is an amenable number.

66087405 is a deficient number, since it is larger than the sum of its proper divisors (50905107).

66087405 is a wasteful number, since it uses less digits than its factorization.

66087405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31305 (or 31302 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 66087405 is about 8129.4160306876. The cubic root of 66087405 is about 404.3023196235.

The spelling of 66087405 in words is "sixty-six million, eighty-seven thousand, four hundred five".