72409885 has 8 divisors (see below), whose sum is σ = 92003256. Its totient is φ = 54520320.

The previous prime is 72409879. The next prime is 72409901. The reversal of 72409885 is 58890427.

It can be written as a sum of positive squares in 4 ways, for example, as 29192409 + 43217476 = 5403^2 + 6574^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72409885 - 2³ = 72409877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425856 + ... + 426025.

It is an arithmetic number, because the mean of its divisors is an integer number (11500407).

Almost surely, 2^72409885 is an apocalyptic number.

It is an amenable number.

72409885 is a deficient number, since it is larger than the sum of its proper divisors (19593371).

72409885 is a wasteful number, since it uses less digits than its factorization.

72409885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851903.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 72409885 is about 8509.3998025713. The cubic root of 72409885 is about 416.8047112376.

The spelling of 72409885 in words is "seventy-two million, four hundred nine thousand, eight hundred eighty-five".