87770665 has 8 divisors (see below), whose sum is σ = 105717960. Its totient is φ = 69954432.

The previous prime is 87770663. The next prime is 87770687. The reversal of 87770665 is 56607778.

It can be written as a sum of positive squares in 4 ways, for example, as 1893376 + 85877289 = 1376^2 + 9267^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87770665 - 2¹ = 87770663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87770663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31284 + ... + 33973.

It is an arithmetic number, because the mean of its divisors is an integer number (13214745).

Almost surely, 2^87770665 is an apocalyptic number.

It is an amenable number.

87770665 is a deficient number, since it is larger than the sum of its proper divisors (17947295).

87770665 is a wasteful number, since it uses less digits than its factorization.

87770665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65531.

The product of its (nonzero) digits is 493920, while the sum is 46.

The square root of 87770665 is about 9368.5999487650. The cubic root of 87770665 is about 444.4092907034.

The spelling of 87770665 in words is "eighty-seven million, seven hundred seventy thousand, six hundred sixty-five".