81479072 has 24 divisors (see below), whose sum is σ = 161263872. Its totient is φ = 40523200.

The previous prime is 81479063. The next prime is 81479081. The reversal of 81479072 is 27097418.

It is an interprime number because it is at equal distance from previous prime (81479063) and next prime (81479081).

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, 554 + ... + 12777.

It is an arithmetic number, because the mean of its divisors is an integer number (6719328).

Almost surely, 2^81479072 is an apocalyptic number.

It is an amenable number.

81479072 is a deficient number, since it is larger than the sum of its proper divisors (79784800).

81479072 is a wasteful number, since it uses less digits than its factorization.

81479072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13532 (or 13524 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 81479072 is about 9026.5758734971. The cubic root of 81479072 is about 433.5262089448.

The spelling of 81479072 in words is "eighty-one million, four hundred seventy-nine thousand, seventy-two".