891220736 has 144 divisors (see below), whose sum is σ = 2141196288. Its totient is φ = 362188800.

The previous prime is 891220727. The next prime is 891220741. The reversal of 891220736 is 637022198.

It is a self number, because there is not a number n which added to its sum of digits gives 891220736.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3388541 + ... + 3388803.

Almost surely, 2^891220736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891220736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1070598144).

891220736 is an abundant number, since it is smaller than the sum of its proper divisors (1249975552).

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

891220736 is a wasteful number, since it uses less digits than its factorization.

891220736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 891220736 is about 29853.3203513445. The cubic root of 891220736 is about 962.3397557707.

The spelling of 891220736 in words is "eight hundred ninety-one million, two hundred twenty thousand, seven hundred thirty-six".