78256787 has 16 divisors (see below), whose sum is σ = 94305792. Its totient is φ = 63486720.

The previous prime is 78256777. The next prime is 78256817. The reversal of 78256787 is 78765287.

It is a cyclic number.

It is not a de Polignac number, because 78256787 - 2¹⁴ = 78240403 is a prime.

It is a super-2 number, since 2×78256787² = 12248249423126738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78256727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13112 + ... + 18122.

It is an arithmetic number, because the mean of its divisors is an integer number (5894112).

Almost surely, 2^78256787 is an apocalyptic number.

78256787 is a deficient number, since it is larger than the sum of its proper divisors (16049005).

78256787 is a wasteful number, since it uses less digits than its factorization.

78256787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5138.

The product of its digits is 1317120, while the sum is 50.

The square root of 78256787 is about 8846.2866220805. The cubic root of 78256787 is about 427.7342277411.

The spelling of 78256787 in words is "seventy-eight million, two hundred fifty-six thousand, seven hundred eighty-seven".