81202928 has 40 divisors (see below), whose sum is σ = 160882560. Its totient is φ = 39695040.

The previous prime is 81202921. The next prime is 81202951. The reversal of 81202928 is 82920218.

It is a junction number, because it is equal to n+sod(n) for n = 81202894 and 81202903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81202921) 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, 226013 + ... + 226371.

It is an arithmetic number, because the mean of its divisors is an integer number (4022064).

Almost surely, 2^81202928 is an apocalyptic number.

It is an amenable number.

81202928 is a deficient number, since it is larger than the sum of its proper divisors (79679632).

81202928 is a wasteful number, since it uses less digits than its factorization.

81202928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 81202928 is about 9011.2667256052. The cubic root of 81202928 is about 433.0358942415.

The spelling of 81202928 in words is "eighty-one million, two hundred two thousand, nine hundred twenty-eight".