55250784 has 144 divisors (see below), whose sum is σ = 172972800. Its totient is φ = 16651008.

The previous prime is 55250779. The next prime is 55250791. The reversal of 55250784 is 48705255.

It is a happy number.

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

It is a super-2 number, since 2×55250784² = 6105298265229312, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

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, 125637 + ... + 126075.

It is an arithmetic number, because the mean of its divisors is an integer number (1201200).

Almost surely, 2^55250784 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 55250784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86486400).

55250784 is an abundant number, since it is smaller than the sum of its proper divisors (117722016).

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

55250784 is a wasteful number, since it uses less digits than its factorization.

55250784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The square root of 55250784 is about 7433.0871110192. The cubic root of 55250784 is about 380.8723816697.

The spelling of 55250784 in words is "fifty-five million, two hundred fifty thousand, seven hundred eighty-four".