72520018 has 4 divisors (see below), whose sum is σ = 108780030. Its totient is φ = 36260008.

The previous prime is 72520001. The next prime is 72520031. The reversal of 72520018 is 81002527.

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., 56655729 + 15864289 = 7527^2 + 3983^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72519974 and 72520001.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18130003 + ... + 18130006.

Almost surely, 2^72520018 is an apocalyptic number.

72520018 is a deficient number, since it is larger than the sum of its proper divisors (36260012).

72520018 is a wasteful number, since it uses less digits than its factorization.

72520018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36260011.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 72520018 is about 8515.8685992681. The cubic root of 72520018 is about 417.0159195099.

The spelling of 72520018 in words is "seventy-two million, five hundred twenty thousand, eighteen".