72404775 has 18 divisors (see below), whose sum is σ = 129685400. Its totient is φ = 38615760.

The previous prime is 72404767. The next prime is 72404797. The reversal of 72404775 is 57740427.

It is a happy number.

It is not a de Polignac number, because 72404775 - 2³ = 72404767 is a prime.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 160675 + ... + 161124.

Almost surely, 2^72404775 is an apocalyptic number.

72404775 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

72404775 is a deficient number, since it is larger than the sum of its proper divisors (57280625).

72404775 is a wasteful number, since it uses less digits than its factorization.

72404775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321815 (or 321807 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 36.

The square root of 72404775 is about 8509.0995410795. The cubic root of 72404775 is about 416.7949063048.

The spelling of 72404775 in words is "seventy-two million, four hundred four thousand, seven hundred seventy-five".