72904219 has 4 divisors (see below), whose sum is σ = 75256000. Its totient is φ = 70552440.

The previous prime is 72904217. The next prime is 72904259. The reversal of 72904219 is 91240927.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72904219 - 2¹ = 72904217 is a prime.

It is a super-2 number, since 2×72904219² = 10630050295999922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72904213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1175844 + ... + 1175905.

It is an arithmetic number, because the mean of its divisors is an integer number (18814000).

Almost surely, 2^72904219 is an apocalyptic number.

72904219 is a deficient number, since it is larger than the sum of its proper divisors (2351781).

72904219 is a wasteful number, since it uses less digits than its factorization.

72904219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351780.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 72904219 is about 8538.3967464624. The cubic root of 72904219 is about 417.7510536612.

The spelling of 72904219 in words is "seventy-two million, nine hundred four thousand, two hundred nineteen".