891389880 has 64 divisors (see below), whose sum is σ = 2971303200. Its totient is φ = 237703680.

The previous prime is 891389879. The next prime is 891389887. The reversal of 891389880 is 88983198.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891389887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411601 + ... + 413760.

Almost surely, 2^891389880 is an apocalyptic number.

It is an amenable number.

891389880 is an abundant number, since it is smaller than the sum of its proper divisors (2079913320).

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

891389880 is a wasteful number, since it uses less digits than its factorization.

891389880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825381 (or 825371 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The square root of 891389880 is about 29856.1531346555. The cubic root of 891389880 is about 962.4006324583.

The spelling of 891389880 in words is "eight hundred ninety-one million, three hundred eighty-nine thousand, eight hundred eighty".