81625602 has 32 divisors (see below), whose sum is σ = 173420352. Its totient is φ = 25524224.

The previous prime is 81625601. The next prime is 81625613. The reversal of 81625602 is 20652618.

It is a self number, because there is not a number n which added to its sum of digits gives 81625602.

It is not an unprimeable number, because it can be changed into a prime (81625601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34873 + ... + 37139.

It is an arithmetic number, because the mean of its divisors is an integer number (5419386).

Almost surely, 2^81625602 is an apocalyptic number.

81625602 is an abundant number, since it is smaller than the sum of its proper divisors (91794750).

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

81625602 is a wasteful number, since it uses less digits than its factorization.

81625602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2642.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 81625602 is about 9034.6888158918. The cubic root of 81625602 is about 433.7859343421.

The spelling of 81625602 in words is "eighty-one million, six hundred twenty-five thousand, six hundred two".