891619650 has 120 divisors (see below), whose sum is σ = 2607995280. Its totient is φ = 225231840.

The previous prime is 891619649. The next prime is 891619691. The reversal of 891619650 is 56916198.

It is a super-2 number, since 2×891619650² = 1589971200532245000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 891619596 and 891619605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 71157 + ... + 82743.

It is an arithmetic number, because the mean of its divisors is an integer number (21733294).

Almost surely, 2^891619650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891619650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1303997640).

891619650 is an abundant number, since it is smaller than the sum of its proper divisors (1716375630).

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

891619650 is a wasteful number, since it uses less digits than its factorization.

891619650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11630 (or 11616 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 891619650 is about 29860.0008372404. Note that the first 3 decimals coincide. The cubic root of 891619650 is about 962.4833167401.

The spelling of 891619650 in words is "eight hundred ninety-one million, six hundred nineteen thousand, six hundred fifty".