72387578 has 8 divisors (see below), whose sum is σ = 113302368. Its totient is φ = 34620124.

The previous prime is 72387571. The next prime is 72387583. The reversal of 72387578 is 87578327.

It is a happy number.

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

It is a super-2 number, since 2×72387578² = 10479922897412168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72387571) 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, 786776 + ... + 786867.

It is an arithmetic number, because the mean of its divisors is an integer number (14162796).

Almost surely, 2^72387578 is an apocalyptic number.

72387578 is a deficient number, since it is larger than the sum of its proper divisors (40914790).

72387578 is a wasteful number, since it uses less digits than its factorization.

72387578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573668.

The product of its digits is 658560, while the sum is 47.

The square root of 72387578 is about 8508.0889746170. The cubic root of 72387578 is about 416.7619057670.

The spelling of 72387578 in words is "seventy-two million, three hundred eighty-seven thousand, five hundred seventy-eight".