891097536 has 140 divisors (see below), whose sum is σ = 2751904072. Its totient is φ = 254467584.

The previous prime is 891097469. The next prime is 891097553. The reversal of 891097536 is 635790198.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 460026 + ... + 461958.

Almost surely, 2^891097536 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 891097536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1375952036).

891097536 is an abundant number, since it is smaller than the sum of its proper divisors (1860806536).

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

891097536 is an equidigital number, since it uses as much as digits as its factorization.

891097536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976 (or 1945 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 891097536 is about 29851.2568579616. The cubic root of 891097536 is about 962.2954099587.

The spelling of 891097536 in words is "eight hundred ninety-one million, ninety-seven thousand, five hundred thirty-six".