81933610 has 32 divisors (see below), whose sum is σ = 162000000. Its totient is φ = 29588160.

The previous prime is 81933583. The next prime is 81933623. The reversal of 81933610 is 1633918.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13891 + ... + 18889.

It is an arithmetic number, because the mean of its divisors is an integer number (5062500).

Almost surely, 2^81933610 is an apocalyptic number.

81933610 is a deficient number, since it is larger than the sum of its proper divisors (80066390).

81933610 is a wasteful number, since it uses less digits than its factorization.

81933610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5166.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 81933610 is about 9051.7186213448. The cubic root of 81933610 is about 434.3308689013.

The spelling of 81933610 in words is "eighty-one million, nine hundred thirty-three thousand, six hundred ten".