891897980 has 12 divisors (see below), whose sum is σ = 1872985800. Its totient is φ = 356759184.

The previous prime is 891897967. The next prime is 891897983. The reversal of 891897980 is 89798198.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891897983) 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, 22297430 + ... + 22297469.

It is an arithmetic number, because the mean of its divisors is an integer number (156082150).

Almost surely, 2^891897980 is an apocalyptic number.

It is an amenable number.

891897980 is an abundant number, since it is smaller than the sum of its proper divisors (981087820).

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

891897980 is a wasteful number, since it uses less digits than its factorization.

891897980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44594908 (or 44594906 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 59.

The square root of 891897980 is about 29864.6610561714. The cubic root of 891897980 is about 962.5834566415.

The spelling of 891897980 in words is "eight hundred ninety-one million, eight hundred ninety-seven thousand, nine hundred eighty".