81472738 has 8 divisors (see below), whose sum is σ = 129397932. Its totient is φ = 38340096.

The previous prime is 81472723. The next prime is 81472747. The reversal of 81472738 is 83727418.

It can be written as a sum of positive squares in 2 ways, for example, as 64850809 + 16621929 = 8053^2 + 4077^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81472738.

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, 1198095 + ... + 1198162.

Almost surely, 2^81472738 is an apocalyptic number.

81472738 is a deficient number, since it is larger than the sum of its proper divisors (47925194).

81472738 is a wasteful number, since it uses less digits than its factorization.

81472738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396276.

The product of its digits is 75264, while the sum is 40.

The square root of 81472738 is about 9026.2250138139. The cubic root of 81472738 is about 433.5149748692.

The spelling of 81472738 in words is "eighty-one million, four hundred seventy-two thousand, seven hundred thirty-eight".