81602620 has 48 divisors (see below), whose sum is σ = 195084288. Its totient is φ = 28381760.

The previous prime is 81602617. The next prime is 81602627. The reversal of 81602620 is 2620618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81602627) 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 15 ways as a sum of consecutive naturals, for example, 3004 + ... + 13123.

It is an arithmetic number, because the mean of its divisors is an integer number (4064256).

Almost surely, 2^81602620 is an apocalyptic number.

It is an amenable number.

81602620 is an abundant number, since it is smaller than the sum of its proper divisors (113481668).

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

81602620 is a wasteful number, since it uses less digits than its factorization.

81602620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16170 (or 16168 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 81602620 is about 9033.4168507824. The cubic root of 81602620 is about 433.7452191585.

The spelling of 81602620 in words is "eighty-one million, six hundred two thousand, six hundred twenty".