78057771 has 16 divisors (see below), whose sum is σ = 116181120. Its totient is φ = 46206720.

The previous prime is 78057751. The next prime is 78057781. The reversal of 78057771 is 17775087.

It is not a de Polignac number, because 78057771 - 2⁵ = 78057739 is a prime.

It is a super-2 number, since 2×78057771² = 12186031226976882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78057751) 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, 26086 + ... + 28923.

It is an arithmetic number, because the mean of its divisors is an integer number (7261320).

Almost surely, 2^78057771 is an apocalyptic number.

78057771 is a deficient number, since it is larger than the sum of its proper divisors (38123349).

78057771 is a wasteful number, since it uses less digits than its factorization.

78057771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55066.

The product of its (nonzero) digits is 96040, while the sum is 42.

The square root of 78057771 is about 8835.0308997762. The cubic root of 78057771 is about 427.3713275073.

It can be divided in two parts, 7805 and 7771, that added together give a triangular number (15576 = T₁₇₆).

The spelling of 78057771 in words is "seventy-eight million, fifty-seven thousand, seven hundred seventy-one".