72420328 has 8 divisors (see below), whose sum is σ = 135788130. Its totient is φ = 36210160.

The previous prime is 72420319. The next prime is 72420331. The reversal of 72420328 is 82302427.

It can be written as a sum of positive squares in only one way, i.e., 55920484 + 16499844 = 7478^2 + 4062^2 .

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

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 72420296 and 72420305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4526263 + ... + 4526278.

Almost surely, 2^72420328 is an apocalyptic number.

It is an amenable number.

72420328 is a deficient number, since it is larger than the sum of its proper divisors (63367802).

72420328 is a wasteful number, since it uses less digits than its factorization.

72420328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9052547 (or 9052543 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 72420328 is about 8510.0133959942. The cubic root of 72420328 is about 416.8247475552.

The spelling of 72420328 in words is "seventy-two million, four hundred twenty thousand, three hundred twenty-eight".