55280736 has 144 divisors (see below), whose sum is σ = 190348704. Its totient is φ = 14856192.

The previous prime is 55280723. The next prime is 55280741. The reversal of 55280736 is 63708255.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 55280736.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33466 + ... + 35078.

It is an arithmetic number, because the mean of its divisors is an integer number (1321866).

Almost surely, 2^55280736 is an apocalyptic number.

55280736 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55280736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95174352).

55280736 is an abundant number, since it is smaller than the sum of its proper divisors (135067968).

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

55280736 is a wasteful number, since it uses less digits than its factorization.

55280736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 55280736 is about 7435.1016132935. The cubic root of 55280736 is about 380.9411941398.

The spelling of 55280736 in words is "fifty-five million, two hundred eighty thousand, seven hundred thirty-six".