81039276 has 36 divisors (see below), whose sum is σ = 205603944. Its totient is φ = 26913600.

The previous prime is 81039263. The next prime is 81039307. The reversal of 81039276 is 67293018.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×81039276³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81039276.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6111 + ... + 14121.

Almost surely, 2^81039276 is an apocalyptic number.

It is an amenable number.

81039276 is an abundant number, since it is smaller than the sum of its proper divisors (124564668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81039276 is a wasteful number, since it uses less digits than its factorization.

81039276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8302 (or 8297 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 81039276 is about 9002.1817355572. The cubic root of 81039276 is about 432.7447928712.

The spelling of 81039276 in words is "eighty-one million, thirty-nine thousand, two hundred seventy-six".