72129628 has 6 divisors (see below), whose sum is σ = 126226856. Its totient is φ = 36064812.

The previous prime is 72129601. The next prime is 72129647. The reversal of 72129628 is 82692127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9016200 + ... + 9016207.

Almost surely, 2^72129628 is an apocalyptic number.

It is an amenable number.

72129628 is a deficient number, since it is larger than the sum of its proper divisors (54097228).

72129628 is a wasteful number, since it uses less digits than its factorization.

72129628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18032411 (or 18032409 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The square root of 72129628 is about 8492.9163424586. The cubic root of 72129628 is about 416.2662789162.

The spelling of 72129628 in words is "seventy-two million, one hundred twenty-nine thousand, six hundred twenty-eight".