78372369 has 12 divisors (see below), whose sum is σ = 113776000. Its totient is φ = 51984504.

The previous prime is 78372367. The next prime is 78372377. The reversal of 78372369 is 96327387.

It is a happy number.

It is not a de Polignac number, because 78372369 - 2¹ = 78372367 is a prime.

It is a super-2 number, since 2×78372369² = 12284456445344322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78372367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20089 + ... + 23670.

Almost surely, 2^78372369 is an apocalyptic number.

It is an amenable number.

78372369 is a deficient number, since it is larger than the sum of its proper divisors (35403631).

78372369 is a wasteful number, since it uses less digits than its factorization.

78372369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43964 (or 43961 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 78372369 is about 8852.8170092914. The cubic root of 78372369 is about 427.9447060050.

The spelling of 78372369 in words is "seventy-eight million, three hundred seventy-two thousand, three hundred sixty-nine".