72309628 has 12 divisors (see below), whose sum is σ = 126608832. Its totient is φ = 36135680.

The previous prime is 72309599. The next prime is 72309661. The reversal of 72309628 is 82690327.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6876 + ... + 13852.

It is an arithmetic number, because the mean of its divisors is an integer number (10550736).

Almost surely, 2^72309628 is an apocalyptic number.

It is an amenable number.

72309628 is a deficient number, since it is larger than the sum of its proper divisors (54299204).

72309628 is a wasteful number, since it uses less digits than its factorization.

72309628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9572 (or 9570 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 72309628 is about 8503.5068060183. The cubic root of 72309628 is about 416.6122564330.

The spelling of 72309628 in words is "seventy-two million, three hundred nine thousand, six hundred twenty-eight".