55420250 has 32 divisors (see below), whose sum is σ = 107108352. Its totient is φ = 21450000.

The previous prime is 55420241. The next prime is 55420259. The reversal of 55420250 is 5202455.

It is an interprime number because it is at equal distance from previous prime (55420241) and next prime (55420259).

It is a super-2 number, since 2×55420250² = 6142808220125000, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55420259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4175 + ... + 11325.

It is an arithmetic number, because the mean of its divisors is an integer number (3347136).

Almost surely, 2^55420250 is an apocalyptic number.

55420250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55420250 is a deficient number, since it is larger than the sum of its proper divisors (51688102).

55420250 is a wasteful number, since it uses less digits than its factorization.

55420250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7199 (or 7189 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 55420250 is about 7444.4778191623. The cubic root of 55420250 is about 381.2613899670.

The spelling of 55420250 in words is "fifty-five million, four hundred twenty thousand, two hundred fifty".