78905079 has 12 divisors (see below), whose sum is σ = 124335432. Its totient is φ = 47821200.

The previous prime is 78905077. The next prime is 78905089. The reversal of 78905079 is 97050987.

It is not a de Polignac number, because 78905079 - 2¹ = 78905077 is a prime.

It is a super-2 number, since 2×78905079² = 12452022983992482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78905077) 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, 398412 + ... + 398609.

It is an arithmetic number, because the mean of its divisors is an integer number (10361286).

Almost surely, 2^78905079 is an apocalyptic number.

78905079 is a deficient number, since it is larger than the sum of its proper divisors (45430353).

78905079 is a wasteful number, since it uses less digits than its factorization.

78905079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797038 (or 797035 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 78905079 is about 8882.8530889574. The cubic root of 78905079 is about 428.9121211425.

The spelling of 78905079 in words is "seventy-eight million, nine hundred five thousand, seventy-nine".