81502620 has 24 divisors (see below), whose sum is σ = 228207504. Its totient is φ = 21734016.

The previous prime is 81502579. The next prime is 81502633. The reversal of 81502620 is 2620518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 679129 + ... + 679248.

It is an arithmetic number, because the mean of its divisors is an integer number (9508646).

Almost surely, 2^81502620 is an apocalyptic number.

It is an amenable number.

81502620 is an abundant number, since it is smaller than the sum of its proper divisors (146704884).

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

81502620 is a wasteful number, since it uses less digits than its factorization.

81502620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358389 (or 1358387 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 81502620 is about 9027.8801498469. The cubic root of 81502620 is about 433.5679689192.

The spelling of 81502620 in words is "eighty-one million, five hundred two thousand, six hundred twenty".