55398250 has 64 divisors (see below), whose sum is σ = 109478304. Its totient is φ = 20966400.

The previous prime is 55398229. The next prime is 55398263. The reversal of 55398250 is 5289355.

It is a Cunningham number, because it is equal to 7443²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 2122849 + 53275401 = 1457^2 + 7299^2 .

It is a super-2 number, since 2×55398250² = 6137932206125000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 490194 + ... + 490306.

Almost surely, 2^55398250 is an apocalyptic number.

55398250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55398250 is a deficient number, since it is larger than the sum of its proper divisors (54080054).

55398250 is a wasteful number, since it uses less digits than its factorization.

55398250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 37.

The square root of 55398250 is about 7443.0000671772. Note that the first 4 decimals coincide. The cubic root of 55398250 is about 381.2109339170.

The spelling of 55398250 in words is "fifty-five million, three hundred ninety-eight thousand, two hundred fifty".