478877621 has 4 divisors (see below), whose sum is σ = 478956000. Its totient is φ = 478799244.

The previous prime is 478877603. The next prime is 478877681. The reversal of 478877621 is 126778874.

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 478877621 - 2⁶ = 478877557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 478877621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478877681) 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, 29171 + ... + 42528.

It is an arithmetic number, because the mean of its divisors is an integer number (119739000).

Almost surely, 2^478877621 is an apocalyptic number.

It is an amenable number.

478877621 is a deficient number, since it is larger than the sum of its proper divisors (78379).

478877621 is an equidigital number, since it uses as much as digits as its factorization.

478877621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78378.

The product of its digits is 1053696, while the sum is 50.

The square root of 478877621 is about 21883.2726300250. The cubic root of 478877621 is about 782.3627790016.

The spelling of 478877621 in words is "four hundred seventy-eight million, eight hundred seventy-seven thousand, six hundred twenty-one".