72281408 has 28 divisors (see below), whose sum is σ = 145462752. Its totient is φ = 35629440.

The previous prime is 72281371. The next prime is 72281413. The reversal of 72281408 is 80418227.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3410 + ... + 12497.

Almost surely, 2^72281408 is an apocalyptic number.

It is an amenable number.

72281408 is an abundant number, since it is smaller than the sum of its proper divisors (73181344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72281408 is a wasteful number, since it uses less digits than its factorization.

72281408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15990 (or 15980 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 72281408 is about 8501.8473286692. The cubic root of 72281408 is about 416.5580528275.

The spelling of 72281408 in words is "seventy-two million, two hundred eighty-one thousand, four hundred eight".