76781157 has 4 divisors (see below), whose sum is σ = 102374880. Its totient is φ = 51187436.

The previous prime is 76781149. The next prime is 76781191. The reversal of 76781157 is 75118767.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 76781157 - 2³ = 76781149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76781137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12796857 + ... + 12796862.

It is an arithmetic number, because the mean of its divisors is an integer number (25593720).

Almost surely, 2^76781157 is an apocalyptic number.

It is an amenable number.

76781157 is a deficient number, since it is larger than the sum of its proper divisors (25593723).

76781157 is a wasteful number, since it uses less digits than its factorization.

76781157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25593722.

The product of its digits is 82320, while the sum is 42.

The square root of 76781157 is about 8762.4857774492. The cubic root of 76781157 is about 425.0286615042.

The spelling of 76781157 in words is "seventy-six million, seven hundred eighty-one thousand, one hundred fifty-seven".