251995648 has 40 divisors (see below), whose sum is σ = 504936432. Its totient is φ = 125638656.

The previous prime is 251995637. The next prime is 251995649. The reversal of 251995648 is 846599152.

It is a super-2 number, since 2×251995648² = 127003613221879808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251995649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346261 + ... + 346987.

Almost surely, 2^251995648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251995648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252468216).

251995648 is an abundant number, since it is smaller than the sum of its proper divisors (252940784).

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

251995648 is an frugal number, since it uses more digits than its factorization.

251995648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422 (or 1406 counting only the distinct ones).

The product of its digits is 777600, while the sum is 49.

The square root of 251995648 is about 15874.3707906802. The cubic root of 251995648 is about 631.6323236605.

The spelling of 251995648 in words is "two hundred fifty-one million, nine hundred ninety-five thousand, six hundred forty-eight".