55640250 has 64 divisors (see below), whose sum is σ = 154327680. Its totient is φ = 14835600.

The previous prime is 55640209. The next prime is 55640251. The reversal of 55640250 is 5204655.

It is a hoax number, since the sum of its digits (27) 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 (27).

It is not an unprimeable number, because it can be changed into a prime (55640251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2629 + ... + 10871.

It is an arithmetic number, because the mean of its divisors is an integer number (2411370).

Almost surely, 2^55640250 is an apocalyptic number.

55640250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55640250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77163840).

55640250 is an abundant number, since it is smaller than the sum of its proper divisors (98687430).

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

55640250 is a wasteful number, since it uses less digits than its factorization.

55640250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8269 (or 8253 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 55640250 is about 7459.2392373485. The cubic root of 55640250 is about 381.7652176070.

The spelling of 55640250 in words is "fifty-five million, six hundred forty thousand, two hundred fifty".