72378965 has 4 divisors (see below), whose sum is σ = 86854764. Its totient is φ = 57903168.

The previous prime is 72378959. The next prime is 72378991. The reversal of 72378965 is 56987327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56987327 = 19 ⋅2999333.

It can be written as a sum of positive squares in 2 ways, for example, as 30724849 + 41654116 = 5543^2 + 6454^2 .

It is a cyclic number.

It is not a de Polignac number, because 72378965 - 2⁴ = 72378949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7237892 + ... + 7237901.

It is an arithmetic number, because the mean of its divisors is an integer number (21713691).

Almost surely, 2^72378965 is an apocalyptic number.

It is an amenable number.

72378965 is a deficient number, since it is larger than the sum of its proper divisors (14475799).

72378965 is a wasteful number, since it uses less digits than its factorization.

72378965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14475798.

The product of its digits is 635040, while the sum is 47.

The square root of 72378965 is about 8507.5827941901. The cubic root of 72378965 is about 416.7453757086.

The spelling of 72378965 in words is "seventy-two million, three hundred seventy-eight thousand, nine hundred sixty-five".