81630902 has 16 divisors (see below), whose sum is σ = 124219872. Its totient is φ = 40228800.

The previous prime is 81630881. The next prime is 81630919. The reversal of 81630902 is 20903618.

It is a super-2 number, since 2×81630902² = 13327208322667208, which contains 22 as substring.

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, 40388 + ... + 42360.

It is an arithmetic number, because the mean of its divisors is an integer number (7763742).

Almost surely, 2^81630902 is an apocalyptic number.

81630902 is a deficient number, since it is larger than the sum of its proper divisors (42588970).

81630902 is a wasteful number, since it uses less digits than its factorization.

81630902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 81630902 is about 9034.9821250515. The cubic root of 81630902 is about 433.7953228005.

The spelling of 81630902 in words is "eighty-one million, six hundred thirty thousand, nine hundred two".