72821284 has 6 divisors (see below), whose sum is σ = 127437254. Its totient is φ = 36410640.

The previous prime is 72821269. The next prime is 72821297. The reversal of 72821284 is 48212827.

It can be written as a sum of positive squares in only one way, i.e., 62062884 + 10758400 = 7878^2 + 3280^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9102657 + ... + 9102664.

Almost surely, 2^72821284 is an apocalyptic number.

It is an amenable number.

72821284 is a deficient number, since it is larger than the sum of its proper divisors (54615970).

72821284 is a wasteful number, since it uses less digits than its factorization.

72821284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18205325 (or 18205323 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 72821284 is about 8533.5387735687. The cubic root of 72821284 is about 417.5925839589.

The spelling of 72821284 in words is "seventy-two million, eight hundred twenty-one thousand, two hundred eighty-four".