72447775 has 12 divisors (see below), whose sum is σ = 92734144. Its totient is φ = 56088000.

The previous prime is 72447763. The next prime is 72447787. The reversal of 72447775 is 57774427.

It is an interprime number because it is at equal distance from previous prime (72447763) and next prime (72447787).

It is not a de Polignac number, because 72447775 - 2¹⁹ = 71923487 is a prime.

It is a super-4 number, since 4×72447775⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45966 + ... + 47515.

Almost surely, 2^72447775 is an apocalyptic number.

72447775 is a deficient number, since it is larger than the sum of its proper divisors (20286369).

72447775 is a wasteful number, since it uses less digits than its factorization.

72447775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93522 (or 93517 counting only the distinct ones).

The product of its digits is 384160, while the sum is 43.

The square root of 72447775 is about 8511.6258728870. The cubic root of 72447775 is about 416.8773991801.

The spelling of 72447775 in words is "seventy-two million, four hundred forty-seven thousand, seven hundred seventy-five".