81502028 has 24 divisors (see below), whose sum is σ = 146372688. Its totient is φ = 39686976.

The previous prime is 81502027. The next prime is 81502033. The reversal of 81502028 is 82020518.

It is a super-2 number, since 2×81502028² = 13285161136225568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81501988 and 81502006.

It is not an unprimeable number, because it can be changed into a prime (81502021) 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, 105050 + ... + 105822.

It is an arithmetic number, because the mean of its divisors is an integer number (6098862).

Almost surely, 2^81502028 is an apocalyptic number.

It is an amenable number.

81502028 is a deficient number, since it is larger than the sum of its proper divisors (64870660).

81502028 is a wasteful number, since it uses less digits than its factorization.

81502028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433 (or 1431 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 81502028 is about 9027.8473624669. The cubic root of 81502028 is about 433.5669191662.

The spelling of 81502028 in words is "eighty-one million, five hundred two thousand, twenty-eight".