81974496 has 24 divisors (see below), whose sum is σ = 215183304. Its totient is φ = 27324800.

The previous prime is 81974491. The next prime is 81974521. The reversal of 81974496 is 69447918.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81974491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426855 + ... + 427046.

It is an arithmetic number, because the mean of its divisors is an integer number (8965971).

Almost surely, 2^81974496 is an apocalyptic number.

It is an amenable number.

81974496 is an abundant number, since it is smaller than the sum of its proper divisors (133208808).

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

81974496 is a wasteful number, since it uses less digits than its factorization.

81974496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853914 (or 853906 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 81974496 is about 9053.9768058020. The cubic root of 81974496 is about 434.4031025829.

It can be divided in two parts, 819744 and 96, that added together give a triangular number (819840 = T₁₂₈₀).

The spelling of 81974496 in words is "eighty-one million, nine hundred seventy-four thousand, four hundred ninety-six".