69640660 has 24 divisors (see below), whose sum is σ = 150199560. Its totient is φ = 27103104.

The previous prime is 69640639. The next prime is 69640679. The reversal of 69640660 is 6604696.

It can be written as a sum of positive squares in 4 ways, for example, as 3283344 + 66357316 = 1812^2 + 8146^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46315 + ... + 47794.

It is an arithmetic number, because the mean of its divisors is an integer number (6258315).

Almost surely, 2^69640660 is an apocalyptic number.

It is an amenable number.

69640660 is an abundant number, since it is smaller than the sum of its proper divisors (80558900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

69640660 is a wasteful number, since it uses less digits than its factorization.

69640660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94155 (or 94153 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 69640660 is about 8345.0979622770. The cubic root of 69640660 is about 411.4221090209.

The spelling of 69640660 in words is "sixty-nine million, six hundred forty thousand, six hundred sixty".