55723299840 has 704 divisors, whose sum is σ = 216076734720. Its totient is φ = 13536460800.

The previous prime is 55723299809. The next prime is 55723299899. The reversal of 55723299840 is 4899232755.

55723299840 is a `hidden beast` number, since 5 + 572 + 3 + 29 + 9 + 8 + 40 = 666.

It is a super-2 number, since 2×55723299840² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 181508967 + ... + 181509273.

It is an arithmetic number, because the mean of its divisors is an integer number (306927180).

Almost surely, 2^55723299840 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 55723299840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108038367360).

55723299840 is an abundant number, since it is smaller than the sum of its proper divisors (160353434880).

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

55723299840 is a wasteful number, since it uses less digits than its factorization.

55723299840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 55723299840 in words is "fifty-five billion, seven hundred twenty-three million, two hundred ninety-nine thousand, eight hundred forty".