78632399 has 8 divisors (see below), whose sum is σ = 81464832. Its totient is φ = 75818520.

The previous prime is 78632387. The next prime is 78632401. The reversal of 78632399 is 99323687.

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 78632399 - 2¹⁶ = 78566863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78632329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4292 + ... + 13254.

It is an arithmetic number, because the mean of its divisors is an integer number (10183104).

Almost surely, 2^78632399 is an apocalyptic number.

78632399 is a deficient number, since it is larger than the sum of its proper divisors (2832433).

78632399 is a wasteful number, since it uses less digits than its factorization.

78632399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9277.

The product of its digits is 489888, while the sum is 47.

The square root of 78632399 is about 8867.4911333477. The cubic root of 78632399 is about 428.4174730452.

The spelling of 78632399 in words is "seventy-eight million, six hundred thirty-two thousand, three hundred ninety-nine".