478672991 has 16 divisors (see below), whose sum is σ = 500279808. Its totient is φ = 457617600.

The previous prime is 478672973. The next prime is 478672993. The reversal of 478672991 is 199276874.

It is a cyclic number.

It is not a de Polignac number, because 478672991 - 2¹⁰ = 478671967 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 (478672993) 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, 744116 + ... + 744758.

It is an arithmetic number, because the mean of its divisors is an integer number (31267488).

Almost surely, 2^478672991 is an apocalyptic number.

478672991 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

478672991 is a deficient number, since it is larger than the sum of its proper divisors (21606817).

478672991 is a wasteful number, since it uses less digits than its factorization.

478672991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022.

The product of its digits is 1524096, while the sum is 53.

The square root of 478672991 is about 21878.5966414667. The cubic root of 478672991 is about 782.2513255409.

It can be divided in two parts, 4786 and 72991, that added together give a palindrome (77777).

The spelling of 478672991 in words is "four hundred seventy-eight million, six hundred seventy-two thousand, nine hundred ninety-one".