78256534 has 24 divisors (see below), whose sum is σ = 125246448. Its totient is φ = 36593040.

The previous prime is 78256513. The next prime is 78256537. The reversal of 78256534 is 43565287.

It is a super-2 number, since 2×78256534² = 12248170227386312, which contains 22 as substring.

Its product of digits (201600) is a multiple of the sum of its prime factors (420).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78256537) 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, 468519 + ... + 468685.

It is an arithmetic number, because the mean of its divisors is an integer number (5218602).

Almost surely, 2^78256534 is an apocalyptic number.

78256534 is a deficient number, since it is larger than the sum of its proper divisors (46989914).

78256534 is a wasteful number, since it uses less digits than its factorization.

78256534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 253 counting only the distinct ones).

The product of its digits is 201600, while the sum is 40.

The square root of 78256534 is about 8846.2723222836. The cubic root of 78256534 is about 427.7337667933.

The spelling of 78256534 in words is "seventy-eight million, two hundred fifty-six thousand, five hundred thirty-four".