72561275 has 12 divisors (see below), whose sum is σ = 90132624. Its totient is φ = 57948000.

The previous prime is 72561257. The next prime is 72561283. The reversal of 72561275 is 57216527.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-72561275 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a plaindrome in base 6.

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, 14330 + ... + 18720.

It is an arithmetic number, because the mean of its divisors is an integer number (7511052).

Almost surely, 2^72561275 is an apocalyptic number.

72561275 is a deficient number, since it is larger than the sum of its proper divisors (17571349).

72561275 is a wasteful number, since it uses less digits than its factorization.

72561275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5062 (or 5057 counting only the distinct ones).

The product of its digits is 29400, while the sum is 35.

The square root of 72561275 is about 8518.2906149063. The cubic root of 72561275 is about 417.0949853304.

The spelling of 72561275 in words is "seventy-two million, five hundred sixty-one thousand, two hundred seventy-five".