55401720 has 192 divisors, whose sum is σ = 195004800. Its totient is φ = 12453120.

The previous prime is 55401677. The next prime is 55401721. The reversal of 55401720 is 2710455.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55401721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1178737 + ... + 1178783.

It is an arithmetic number, because the mean of its divisors is an integer number (1015650).

Almost surely, 2^55401720 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 55401720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97502400).

55401720 is an abundant number, since it is smaller than the sum of its proper divisors (139603080).

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

55401720 is a wasteful number, since it uses less digits than its factorization.

55401720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 55401720 is about 7443.2331684558. The cubic root of 55401720 is about 381.2188930994.

It can be divided in two parts, 5540 and 1720, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 55401720 in words is "fifty-five million, four hundred one thousand, seven hundred twenty".