891714640 has 40 divisors (see below), whose sum is σ = 2091604968. Its totient is φ = 353525760.

The previous prime is 891714601. The next prime is 891714641. The reversal of 891714640 is 46417198.

It can be written as a sum of positive squares in 4 ways, for example, as 2005056 + 889709584 = 1416^2 + 29828^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 891714593 and 891714602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891714641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40281 + ... + 58360.

Almost surely, 2^891714640 is an apocalyptic number.

891714640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

891714640 is an abundant number, since it is smaller than the sum of its proper divisors (1199890328).

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

891714640 is a wasteful number, since it uses less digits than its factorization.

891714640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98767 (or 98761 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 891714640 is about 29861.5913842514. The cubic root of 891714640 is about 962.5174953811.

The spelling of 891714640 in words is "eight hundred ninety-one million, seven hundred fourteen thousand, six hundred forty".