476678991 has 4 divisors (see below), whose sum is σ = 635571992. Its totient is φ = 317785992.

The previous prime is 476678987. The next prime is 476678999. The reversal of 476678991 is 199876674.

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

It is not a de Polignac number, because 476678991 - 2² = 476678987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (476678999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79446496 + ... + 79446501.

It is an arithmetic number, because the mean of its divisors is an integer number (158892998).

Almost surely, 2^476678991 is an apocalyptic number.

476678991 is a deficient number, since it is larger than the sum of its proper divisors (158893001).

476678991 is a wasteful number, since it uses less digits than its factorization.

476678991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158893000.

The product of its digits is 4572288, while the sum is 57.

The square root of 476678991 is about 21832.9794347908. The cubic root of 476678991 is about 781.1636100656.

The spelling of 476678991 in words is "four hundred seventy-six million, six hundred seventy-eight thousand, nine hundred ninety-one".