72921436 has 24 divisors (see below), whose sum is σ = 147187040. Its totient is φ = 30964032.

The previous prime is 72921427. The next prime is 72921479. The reversal of 72921436 is 63412927.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8895 + ... + 14998.

Almost surely, 2^72921436 is an apocalyptic number.

It is an amenable number.

72921436 is an abundant number, since it is smaller than the sum of its proper divisors (74265604).

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

72921436 is a wasteful number, since it uses less digits than its factorization.

72921436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24013 (or 24011 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 72921436 is about 8539.4048972982. The cubic root of 72921436 is about 417.7839363204.

The spelling of 72921436 in words is "seventy-two million, nine hundred twenty-one thousand, four hundred thirty-six".