78920807 has 8 divisors (see below), whose sum is σ = 90256416. Its totient is φ = 67600512.

The previous prime is 78920801. The next prime is 78920837. The reversal of 78920807 is 70802987.

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

It is not a de Polignac number, because 78920807 - 2¹² = 78916711 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 (78920801) 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, 11123 + ... + 16779.

It is an arithmetic number, because the mean of its divisors is an integer number (11282052).

Almost surely, 2^78920807 is an apocalyptic number.

78920807 is a deficient number, since it is larger than the sum of its proper divisors (11335609).

78920807 is a wasteful number, since it uses less digits than its factorization.

78920807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7657.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 78920807 is about 8883.7383459893. The cubic root of 78920807 is about 428.9406173296.

Subtracting from 78920807 its sum of digits (41), we obtain a triangular number (78920766 = T₁₂₅₆₃).

The spelling of 78920807 in words is "seventy-eight million, nine hundred twenty thousand, eight hundred seven".