55250000 has 140 divisors (see below), whose sum is σ = 152576172. Its totient is φ = 19200000.

The previous prime is 55249981. The next prime is 55250003. The reversal of 55250000 is 5255.

It is a happy number.

It can be written as a sum of positive squares in 14 ways, for example, as 43771456 + 11478544 = 6616^2 + 3388^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55250003) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3249992 + ... + 3250008.

Almost surely, 2^55250000 is an apocalyptic number.

55250000 is a gapful number since it is divisible by the number (50) 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 55250000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76288086).

55250000 is an abundant number, since it is smaller than the sum of its proper divisors (97326172).

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

55250000 is an equidigital number, since it uses as much as digits as its factorization.

55250000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 17.

The square root of 55250000 is about 7433.0343736593. The cubic root of 55250000 is about 380.8705801547.

Adding to 55250000 its reverse (5255), we get a palindrome (55255255).

The spelling of 55250000 in words is "fifty-five million, two hundred fifty thousand".