78672399 has 16 divisors (see below), whose sum is σ = 115723104. Its totient is φ = 47232000.

The previous prime is 78672383. The next prime is 78672401. The reversal of 78672399 is 99327687.

It is not a de Polignac number, because 78672399 - 2⁴ = 78672383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78672329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23002 + ... + 26199.

It is an arithmetic number, because the mean of its divisors is an integer number (7232694).

Almost surely, 2^78672399 is an apocalyptic number.

78672399 is a deficient number, since it is larger than the sum of its proper divisors (37050705).

78672399 is a wasteful number, since it uses less digits than its factorization.

78672399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49258.

The product of its digits is 1143072, while the sum is 51.

The square root of 78672399 is about 8869.7462759653. The cubic root of 78672399 is about 428.4901055061.

The spelling of 78672399 in words is "seventy-eight million, six hundred seventy-two thousand, three hundred ninety-nine".