78013775 has 48 divisors (see below), whose sum is σ = 115492608. Its totient is φ = 51168000.

The previous prime is 78013757. The next prime is 78013777. The reversal of 78013775 is 57731087.

It is not a de Polignac number, because 78013775 - 2⁶ = 78013711 is a prime.

It is a super-2 number, since 2×78013775² = 12172298179501250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78013777) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 595460 + ... + 595590.

It is an arithmetic number, because the mean of its divisors is an integer number (2406096).

Almost surely, 2^78013775 is an apocalyptic number.

78013775 is a deficient number, since it is larger than the sum of its proper divisors (37478833).

78013775 is a wasteful number, since it uses less digits than its factorization.

78013775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 38.

The square root of 78013775 is about 8832.5406877070. The cubic root of 78013775 is about 427.2910187719.

The spelling of 78013775 in words is "seventy-eight million, thirteen thousand, seven hundred seventy-five".