72387905 has 8 divisors (see below), whose sum is σ = 87205032. Its totient is φ = 57683968.

The previous prime is 72387893. The next prime is 72387911. The reversal of 72387905 is 50978327.

It can be written as a sum of positive squares in 4 ways, for example, as 7246864 + 65141041 = 2692^2 + 8071^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 72387905 - 2¹² = 72383809 is a prime.

It is a Duffinian 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, 26882 + ... + 29451.

It is an arithmetic number, because the mean of its divisors is an integer number (10900629).

Almost surely, 2^72387905 is an apocalyptic number.

It is an amenable number.

72387905 is a deficient number, since it is larger than the sum of its proper divisors (14817127).

72387905 is a wasteful number, since it uses less digits than its factorization.

72387905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56595.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 72387905 is about 8508.1081916017. The cubic root of 72387905 is about 416.7625333191.

The spelling of 72387905 in words is "seventy-two million, three hundred eighty-seven thousand, nine hundred five".