78820791 has 8 divisors (see below), whose sum is σ = 120107904. Its totient is φ = 45040440.

The previous prime is 78820783. The next prime is 78820799. The reversal of 78820791 is 19702887.

It is an interprime number because it is at equal distance from previous prime (78820783) and next prime (78820799).

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

It is not a de Polignac number, because 78820791 - 2³ = 78820783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78820799) 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, 1876665 + ... + 1876706.

It is an arithmetic number, because the mean of its divisors is an integer number (15013488).

Almost surely, 2^78820791 is an apocalyptic number.

78820791 is a deficient number, since it is larger than the sum of its proper divisors (41287113).

78820791 is a wasteful number, since it uses less digits than its factorization.

78820791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753381.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 78820791 is about 8878.1073996658. The cubic root of 78820791 is about 428.7593425306.

The spelling of 78820791 in words is "seventy-eight million, eight hundred twenty thousand, seven hundred ninety-one".