72280436 has 6 divisors (see below), whose sum is σ = 126490770. Its totient is φ = 36140216.

The previous prime is 72280409. The next prime is 72280457. The reversal of 72280436 is 63408227.

It can be written as a sum of positive squares in only one way, i.e., 38987536 + 33292900 = 6244^2 + 5770^2 .

It is a super-2 number, since 2×72280436² = 10448922856700192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9035051 + ... + 9035058.

It is an arithmetic number, because the mean of its divisors is an integer number (21081795).

Almost surely, 2^72280436 is an apocalyptic number.

It is an amenable number.

72280436 is a deficient number, since it is larger than the sum of its proper divisors (54210334).

72280436 is a wasteful number, since it uses less digits than its factorization.

72280436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18070113 (or 18070111 counting only the distinct ones).

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

The square root of 72280436 is about 8501.7901644301. The cubic root of 72280436 is about 416.5561856058.

The spelling of 72280436 in words is "seventy-two million, two hundred eighty thousand, four hundred thirty-six".