76780457 has 4 divisors (see below), whose sum is σ = 82686660. Its totient is φ = 70874256.

The previous prime is 76780433. The next prime is 76780477. The reversal of 76780457 is 75408767.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17505856 + 59274601 = 4184^2 + 7699^2 .

It is a cyclic number.

It is not a de Polignac number, because 76780457 - 2⁸ = 76780201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76780427) 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, 2953082 + ... + 2953107.

It is an arithmetic number, because the mean of its divisors is an integer number (20671665).

Almost surely, 2^76780457 is an apocalyptic number.

It is an amenable number.

76780457 is a deficient number, since it is larger than the sum of its proper divisors (5906203).

76780457 is a wasteful number, since it uses less digits than its factorization.

76780457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5906202.

The product of its (nonzero) digits is 329280, while the sum is 44.

The square root of 76780457 is about 8762.4458343547. The cubic root of 76780457 is about 425.0273698636.

The spelling of 76780457 in words is "seventy-six million, seven hundred eighty thousand, four hundred fifty-seven".