81037996 has 12 divisors (see below), whose sum is σ = 152725552. Its totient is φ = 37402128.

The previous prime is 81037981. The next prime is 81038003. The reversal of 81037996 is 69973018.

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, 779160 + ... + 779263.

Almost surely, 2^81037996 is an apocalyptic number.

It is an amenable number.

81037996 is a deficient number, since it is larger than the sum of its proper divisors (71687556).

81037996 is a wasteful number, since it uses less digits than its factorization.

81037996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558440 (or 1558438 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 81037996 is about 9002.1106413996. The cubic root of 81037996 is about 432.7425144852.

The spelling of 81037996 in words is "eighty-one million, thirty-seven thousand, nine hundred ninety-six".