251878698 has 48 divisors (see below), whose sum is σ = 579478536. Its totient is φ = 78796800.

The previous prime is 251878691. The next prime is 251878709. The reversal of 251878698 is 896878152.

251878698 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 144072009 + 107806689 = 12003^2 + 10383^2 .

It is not an unprimeable number, because it can be changed into a prime (251878691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131548 + ... + 133448.

Almost surely, 2^251878698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251878698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289739268).

251878698 is an abundant number, since it is smaller than the sum of its proper divisors (327599838).

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

251878698 is a wasteful number, since it uses less digits than its factorization.

251878698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359 (or 2356 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The square root of 251878698 is about 15870.6867526267. The cubic root of 251878698 is about 631.5345960062.

The spelling of 251878698 in words is "two hundred fifty-one million, eight hundred seventy-eight thousand, six hundred ninety-eight".