72732646 has 32 divisors (see below), whose sum is σ = 132341760. Its totient is φ = 29284416.

The previous prime is 72732643. The next prime is 72732659. The reversal of 72732646 is 64623727.

It is a happy number.

It is a super-2 number, since 2×72732646² = 10580075588322632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72732643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32706 + ... + 34858.

It is an arithmetic number, because the mean of its divisors is an integer number (4135680).

Almost surely, 2^72732646 is an apocalyptic number.

72732646 is a deficient number, since it is larger than the sum of its proper divisors (59609114).

72732646 is a wasteful number, since it uses less digits than its factorization.

72732646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308.

The product of its digits is 84672, while the sum is 37.

The square root of 72732646 is about 8528.3436844442. The cubic root of 72732646 is about 417.4230840653.

The spelling of 72732646 in words is "seventy-two million, seven hundred thirty-two thousand, six hundred forty-six".