81938662 has 8 divisors (see below), whose sum is σ = 132362496. Its totient is φ = 37817832.

The previous prime is 81938629. The next prime is 81938671. The reversal of 81938662 is 26683918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1575718 + ... + 1575769.

It is an arithmetic number, because the mean of its divisors is an integer number (16545312).

Almost surely, 2^81938662 is an apocalyptic number.

81938662 is a deficient number, since it is larger than the sum of its proper divisors (50423834).

81938662 is a wasteful number, since it uses less digits than its factorization.

81938662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151502.

The product of its digits is 124416, while the sum is 43.

The square root of 81938662 is about 9051.9976800704. The cubic root of 81938662 is about 434.3397956183.

The spelling of 81938662 in words is "eighty-one million, nine hundred thirty-eight thousand, six hundred sixty-two".