72407282 has 4 divisors (see below), whose sum is σ = 108610926. Its totient is φ = 36203640.

The previous prime is 72407239. The next prime is 72407303. The reversal of 72407282 is 28270427.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28270427 = 23 ⋅1229149.

It can be written as a sum of positive squares in only one way, i.e., 64176121 + 8231161 = 8011^2 + 2869^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18101819 + ... + 18101822.

Almost surely, 2^72407282 is an apocalyptic number.

72407282 is a deficient number, since it is larger than the sum of its proper divisors (36203644).

72407282 is a wasteful number, since it uses less digits than its factorization.

72407282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36203643.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 72407282 is about 8509.2468526891. The cubic root of 72407282 is about 416.7997167277.

The spelling of 72407282 in words is "seventy-two million, four hundred seven thousand, two hundred eighty-two".