72847445 has 18 divisors (see below), whose sum is σ = 96364086. Its totient is φ = 52827280.

The previous prime is 72847429. The next prime is 72847459. The reversal of 72847445 is 54474827.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 58277956 + 14569489 = 7634^2 + 3817^2 .

It is not a de Polignac number, because 72847445 - 2⁴ = 72847429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 209762 + ... + 210108.

Almost surely, 2^72847445 is an apocalyptic number.

It is an amenable number.

72847445 is a deficient number, since it is larger than the sum of its proper divisors (23516641).

72847445 is an equidigital number, since it uses as much as digits as its factorization.

72847445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 363 counting only the distinct ones).

The product of its digits is 250880, while the sum is 41.

The square root of 72847445 is about 8535.0714701167. The cubic root of 72847445 is about 417.6425845952.

Multiplying 72847445 by its product of digits (250880), we get a square (18275967001600 = 4275040²).

The spelling of 72847445 in words is "seventy-two million, eight hundred forty-seven thousand, four hundred forty-five".