251378028 has 36 divisors (see below), whose sum is σ = 693195048. Its totient is φ = 76175040.

The previous prime is 251378027. The next prime is 251378041. The reversal of 251378028 is 820873152.

251378028 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×251378028² = 126381825922337568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 251377983 and 251378001.

It is not an unprimeable number, because it can be changed into a prime (251378027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 317001 + ... + 317792.

It is an arithmetic number, because the mean of its divisors is an integer number (19255418).

Almost surely, 2^251378028 is an apocalyptic number.

It is an amenable number.

251378028 is an abundant number, since it is smaller than the sum of its proper divisors (441817020).

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

251378028 is a wasteful number, since it uses less digits than its factorization.

251378028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634814 (or 634809 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 251378028 is about 15854.9054869463. The cubic root of 251378028 is about 631.1158757226.

The spelling of 251378028 in words is "two hundred fifty-one million, three hundred seventy-eight thousand, twenty-eight".