251888428 has 12 divisors (see below), whose sum is σ = 480877992. Its totient is φ = 114494720.

The previous prime is 251888411. The next prime is 251888431. The reversal of 251888428 is 824888152.

It is a super-2 number, since 2×251888428² = 126895560320622368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2862325 + ... + 2862412.

It is an arithmetic number, because the mean of its divisors is an integer number (40073166).

Almost surely, 2^251888428 is an apocalyptic number.

It is an amenable number.

251888428 is a deficient number, since it is larger than the sum of its proper divisors (228989564).

251888428 is a wasteful number, since it uses less digits than its factorization.

251888428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5724752 (or 5724750 counting only the distinct ones).

The product of its digits is 327680, while the sum is 46.

The square root of 251888428 is about 15870.9932896464. The cubic root of 251888428 is about 631.5427279000.

The spelling of 251888428 in words is "two hundred fifty-one million, eight hundred eighty-eight thousand, four hundred twenty-eight".