72247656 has 32 divisors (see below), whose sum is σ = 194513760. Its totient is φ = 22229952.

The previous prime is 72247649. The next prime is 72247657. The reversal of 72247656 is 65674227.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (72247657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115470 + ... + 116093.

It is an arithmetic number, because the mean of its divisors is an integer number (6078555).

Almost surely, 2^72247656 is an apocalyptic number.

It is an amenable number.

72247656 is an abundant number, since it is smaller than the sum of its proper divisors (122266104).

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

72247656 is a wasteful number, since it uses less digits than its factorization.

72247656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231585 (or 231581 counting only the distinct ones).

The product of its digits is 141120, while the sum is 39.

The square root of 72247656 is about 8499.8621165287. The cubic root of 72247656 is about 416.4932050944.

The spelling of 72247656 in words is "seventy-two million, two hundred forty-seven thousand, six hundred fifty-six".