72409015 has 16 divisors (see below), whose sum is σ = 101332800. Its totient is φ = 49650720.

The previous prime is 72409003. The next prime is 72409031. The reversal of 72409015 is 51090427.

It is a happy number.

It is not a de Polignac number, because 72409015 - 2⁹ = 72408503 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19396 + ... + 22825.

It is an arithmetic number, because the mean of its divisors is an integer number (6333300).

Almost surely, 2^72409015 is an apocalyptic number.

72409015 is a deficient number, since it is larger than the sum of its proper divisors (28923785).

72409015 is an equidigital number, since it uses as much as digits as its factorization.

72409015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42247 (or 42233 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 72409015 is about 8509.3486824786. The cubic root of 72409015 is about 416.8030419372.

The spelling of 72409015 in words is "seventy-two million, four hundred nine thousand, fifteen".