891515040 has 96 divisors (see below), whose sum is σ = 3024314496. Its totient is φ = 219448320.

The previous prime is 891515039. The next prime is 891515063. The reversal of 891515040 is 40515198.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 891514992 and 891515010.

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, 65196 + ... + 77675.

It is an arithmetic number, because the mean of its divisors is an integer number (31503276).

Almost surely, 2^891515040 is an apocalyptic number.

891515040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

891515040 is an abundant number, since it is smaller than the sum of its proper divisors (2132799456).

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

891515040 is a wasteful number, since it uses less digits than its factorization.

891515040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142902 (or 142894 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 891515040 is about 29858.2491114265. The cubic root of 891515040 is about 962.4456738888.

The spelling of 891515040 in words is "eight hundred ninety-one million, five hundred fifteen thousand, forty".