72120404 has 6 divisors (see below), whose sum is σ = 126210714. Its totient is φ = 36060200.

The previous prime is 72120383. The next prime is 72120407. The reversal of 72120404 is 40402127.

It can be written as a sum of positive squares in only one way, i.e., 56280004 + 15840400 = 7502^2 + 3980^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72120407) by changing a digit.

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, 9015047 + ... + 9015054.

It is an arithmetic number, because the mean of its divisors is an integer number (21035119).

Almost surely, 2^72120404 is an apocalyptic number.

It is an amenable number.

72120404 is a deficient number, since it is larger than the sum of its proper divisors (54090310).

72120404 is a wasteful number, since it uses less digits than its factorization.

72120404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18030105 (or 18030103 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 72120404 is about 8492.3732843063. The cubic root of 72120404 is about 416.2485339943.

The spelling of 72120404 in words is "seventy-two million, one hundred twenty thousand, four hundred four".