81929502 has 16 divisors (see below), whose sum is σ = 182065680. Its totient is φ = 27309816.

The previous prime is 81929489. The next prime is 81929509. The reversal of 81929502 is 20592918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81929509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758553 + ... + 758660.

It is an arithmetic number, because the mean of its divisors is an integer number (11379105).

Almost surely, 2^81929502 is an apocalyptic number.

81929502 is an abundant number, since it is smaller than the sum of its proper divisors (100136178).

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

81929502 is a wasteful number, since it uses less digits than its factorization.

81929502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517224 (or 1517218 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 81929502 is about 9051.4917002669. The cubic root of 81929502 is about 434.3236099306.

The spelling of 81929502 in words is "eighty-one million, nine hundred twenty-nine thousand, five hundred two".