87891340 has 24 divisors (see below), whose sum is σ = 194286960. Its totient is φ = 33306048.

The previous prime is 87891319. The next prime is 87891341. The reversal of 87891340 is 4319878.

It is a junction number, because it is equal to n+sod(n) for n = 87891293 and 87891302.

It is not an unprimeable number, because it can be changed into a prime (87891341) 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, 115267 + ... + 116026.

It is an arithmetic number, because the mean of its divisors is an integer number (8095290).

Almost surely, 2^87891340 is an apocalyptic number.

It is an amenable number.

87891340 is an abundant number, since it is smaller than the sum of its proper divisors (106395620).

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

87891340 is a wasteful number, since it uses less digits than its factorization.

87891340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231321 (or 231319 counting only the distinct ones).

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

The square root of 87891340 is about 9375.0381332558. The cubic root of 87891340 is about 444.6128687131.

The spelling of 87891340 in words is "eighty-seven million, eight hundred ninety-one thousand, three hundred forty".