55723620640 has 96 divisors (see below), whose sum is σ = 137055829680. Its totient is φ = 21383491584.

The previous prime is 55723620583. The next prime is 55723620649. The reversal of 55723620640 is 4602632755.

55723620640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 8636356624 + 47087264016 = 92932^2 + 216996^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 55723620593 and 55723620602.

It is not an unprimeable number, because it can be changed into a prime (55723620649) 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, 690234 + ... + 766726.

Almost surely, 2^55723620640 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 55723620640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68527914840).

55723620640 is an abundant number, since it is smaller than the sum of its proper divisors (81332209040).

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

55723620640 is a wasteful number, since it uses less digits than its factorization.

55723620640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76694 (or 76686 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 40.

The spelling of 55723620640 in words is "fifty-five billion, seven hundred twenty-three million, six hundred twenty thousand, six hundred forty".