87991254 has 48 divisors (see below), whose sum is σ = 210882672. Its totient is φ = 26339904.

The previous prime is 87991247. The next prime is 87991271. The reversal of 87991254 is 45219978.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3577 + ... + 13739.

It is an arithmetic number, because the mean of its divisors is an integer number (4393389).

Almost surely, 2^87991254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87991254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105441336).

87991254 is an abundant number, since it is smaller than the sum of its proper divisors (122891418).

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

87991254 is a wasteful number, since it uses less digits than its factorization.

87991254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10221 (or 10218 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 87991254 is about 9380.3653446974. The cubic root of 87991254 is about 444.7812820727.

The spelling of 87991254 in words is "eighty-seven million, nine hundred ninety-one thousand, two hundred fifty-four".