477778889 has 4 divisors (see below), whose sum is σ = 546033024. Its totient is φ = 409524756.

The previous prime is 477778867. The next prime is 477778907. The reversal of 477778889 is 988877774.

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 477778889 - 2²⁰ = 476730313 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (477778859) 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, 34127057 + ... + 34127070.

It is an arithmetic number, because the mean of its divisors is an integer number (136508256).

Almost surely, 2^477778889 is an apocalyptic number.

It is an amenable number.

477778889 is a deficient number, since it is larger than the sum of its proper divisors (68254135).

477778889 is an equidigital number, since it uses as much as digits as its factorization.

477778889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68254134.

The product of its digits is 44255232, while the sum is 65.

The square root of 477778889 is about 21858.1538332953. The cubic root of 477778889 is about 781.7639723705.

The spelling of 477778889 in words is "four hundred seventy-seven million, seven hundred seventy-eight thousand, eight hundred eighty-nine".