72564442 has 4 divisors (see below), whose sum is σ = 108846666. Its totient is φ = 36282220.

The previous prime is 72564433. The next prime is 72564469. The reversal of 72564442 is 24446527.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 51136801 + 21427641 = 7151^2 + 4629^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72564398 and 72564407.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18141109 + ... + 18141112.

Almost surely, 2^72564442 is an apocalyptic number.

72564442 is a deficient number, since it is larger than the sum of its proper divisors (36282224).

72564442 is a wasteful number, since it uses less digits than its factorization.

72564442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36282223.

The product of its digits is 53760, while the sum is 34.

The square root of 72564442 is about 8518.4765069818. The cubic root of 72564442 is about 417.1010534000.

The spelling of 72564442 in words is "seventy-two million, five hundred sixty-four thousand, four hundred forty-two".