56621998 has 8 divisors (see below), whose sum is σ = 88625808. Its totient is φ = 27080064.

The previous prime is 56621993. The next prime is 56622001. The reversal of 56621998 is 89912665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 1230913 = 56621998 / (5 + 6 + 6 + 2 + 1 + 9 + 9 + 8).

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56621993) 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, 615411 + ... + 615502.

It is an arithmetic number, because the mean of its divisors is an integer number (11078226).

Almost surely, 2^56621998 is an apocalyptic number.

56621998 is a deficient number, since it is larger than the sum of its proper divisors (32003810).

56621998 is a wasteful number, since it uses less digits than its factorization.

56621998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230938.

The product of its digits is 233280, while the sum is 46.

The square root of 56621998 is about 7524.7589994630. The cubic root of 56621998 is about 383.9974998029.

The spelling of 56621998 in words is "fifty-six million, six hundred twenty-one thousand, nine hundred ninety-eight".