56121604 has 48 divisors (see below), whose sum is σ = 123096960. Its totient is φ = 21749760.

The previous prime is 56121577. The next prime is 56121613. The reversal of 56121604 is 40612165.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78802 + ... + 79510.

It is an arithmetic number, because the mean of its divisors is an integer number (2564520).

Almost surely, 2^56121604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56121604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61548480).

56121604 is an abundant number, since it is smaller than the sum of its proper divisors (66975356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56121604 is a wasteful number, since it uses less digits than its factorization.

56121604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988 (or 986 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 56121604 is about 7491.4353764816. The cubic root of 56121604 is about 382.8629650166.

Adding to 56121604 its reverse (40612165), we get a palindrome (96733769).

The spelling of 56121604 in words is "fifty-six million, one hundred twenty-one thousand, six hundred four".