891998796402 has 48 divisors (see below), whose sum is σ = 2222309643840. Its totient is φ = 253293254496.

The previous prime is 891998796401. The next prime is 891998796419. The reversal of 891998796402 is 204697899198.

It is not an unprimeable number, because it can be changed into a prime (891998796401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21695277 + ... + 21736352.

It is an arithmetic number, because the mean of its divisors is an integer number (46298117580).

Almost surely, 2^891998796402 is an apocalyptic number.

891998796402 is an abundant number, since it is smaller than the sum of its proper divisors (1330310847438).

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

891998796402 is a wasteful number, since it uses less digits than its factorization.

891998796402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43431807 (or 43431804 counting only the distinct ones).

The product of its (nonzero) digits is 141087744, while the sum is 72.

It can be divided in two parts, 891998796 and 402, that added together give a palindrome (891999198).

The spelling of 891998796402 in words is "eight hundred ninety-one billion, nine hundred ninety-eight million, seven hundred ninety-six thousand, four hundred two".