72820634 has 4 divisors (see below), whose sum is σ = 109230954. Its totient is φ = 36410316.

The previous prime is 72820613. The next prime is 72820651. The reversal of 72820634 is 43602827.

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., 54715609 + 18105025 = 7397^2 + 4255^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72820634.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18205157 + ... + 18205160.

Almost surely, 2^72820634 is an apocalyptic number.

72820634 is a deficient number, since it is larger than the sum of its proper divisors (36410320).

72820634 is a wasteful number, since it uses less digits than its factorization.

72820634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36410319.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 72820634 is about 8533.5006884631. The cubic root of 72820634 is about 417.5913414833.

The spelling of 72820634 in words is "seventy-two million, eight hundred twenty thousand, six hundred thirty-four".