251632560 has 160 divisors (see below), whose sum is σ = 821018880. Its totient is φ = 63673344.

The previous prime is 251632547. The next prime is 251632567. The reversal of 251632560 is 65236152.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (251632567) 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 31 ways as a sum of consecutive naturals, for example, 381511 + ... + 382169.

It is an arithmetic number, because the mean of its divisors is an integer number (5131368).

Almost surely, 2^251632560 is an apocalyptic number.

251632560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251632560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (410509440).

251632560 is an abundant number, since it is smaller than the sum of its proper divisors (569386320).

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

251632560 is a wasteful number, since it uses less digits than its factorization.

251632560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755 (or 749 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 251632560 is about 15862.9303724123. The cubic root of 251632560 is about 631.3288153069.

The spelling of 251632560 in words is "two hundred fifty-one million, six hundred thirty-two thousand, five hundred sixty".