72615736 has 8 divisors (see below), whose sum is σ = 136154520. Its totient is φ = 36307864.

The previous prime is 72615731. The next prime is 72615737. The reversal of 72615736 is 63751627.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×72615736² = 10546090229643392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72615695 and 72615704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72615731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4538476 + ... + 4538491.

It is an arithmetic number, because the mean of its divisors is an integer number (17019315).

Almost surely, 2^72615736 is an apocalyptic number.

It is an amenable number.

72615736 is a deficient number, since it is larger than the sum of its proper divisors (63538784).

72615736 is a wasteful number, since it uses less digits than its factorization.

72615736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9076973 (or 9076969 counting only the distinct ones).

The product of its digits is 52920, while the sum is 37.

The square root of 72615736 is about 8521.4867247447. The cubic root of 72615736 is about 417.1993097070.

The spelling of 72615736 in words is "seventy-two million, six hundred fifteen thousand, seven hundred thirty-six".