81692330 has 16 divisors (see below), whose sum is σ = 147899304. Its totient is φ = 32487360.

The previous prime is 81692323. The next prime is 81692357. The reversal of 81692330 is 3329618.

It can be written as a sum of positive squares in 4 ways, for example, as 70274689 + 11417641 = 8383^2 + 3379^2 .

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, 21881 + ... + 25340.

Almost surely, 2^81692330 is an apocalyptic number.

81692330 is a deficient number, since it is larger than the sum of its proper divisors (66206974).

81692330 is a wasteful number, since it uses less digits than its factorization.

81692330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47401.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 81692330 is about 9038.3809390842. The cubic root of 81692330 is about 433.9041071666.

The spelling of 81692330 in words is "eighty-one million, six hundred ninety-two thousand, three hundred thirty".