78074879 has 4 divisors (see below), whose sum is σ = 78483840. Its totient is φ = 77665920.

The previous prime is 78074851. The next prime is 78074891. The reversal of 78074879 is 97847087.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78074879 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 (78074809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204194 + ... + 204575.

It is an arithmetic number, because the mean of its divisors is an integer number (19620960).

Almost surely, 2^78074879 is an apocalyptic number.

78074879 is a deficient number, since it is larger than the sum of its proper divisors (408961).

78074879 is a wasteful number, since it uses less digits than its factorization.

78074879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408960.

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 78074879 is about 8835.9990380262. Note that the first 3 decimals coincide. The cubic root of 78074879 is about 427.4025476941.

The spelling of 78074879 in words is "seventy-eight million, seventy-four thousand, eight hundred seventy-nine".