81472648 has 16 divisors (see below), whose sum is σ = 153253980. Its totient is φ = 40604928.

The previous prime is 81472639. The next prime is 81472663. The reversal of 81472648 is 84627418.

It can be written as a sum of positive squares in 2 ways, for example, as 46212804 + 35259844 = 6798^2 + 5938^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81472648.

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, 13765 + ... + 18772.

Almost surely, 2^81472648 is an apocalyptic number.

It is an amenable number.

81472648 is a deficient number, since it is larger than the sum of its proper divisors (71781332).

81472648 is a wasteful number, since it uses less digits than its factorization.

81472648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32856 (or 32852 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The square root of 81472648 is about 9026.2200283397. The cubic root of 81472648 is about 433.5148152397.

The spelling of 81472648 in words is "eighty-one million, four hundred seventy-two thousand, six hundred forty-eight".