87921375 has 16 divisors (see below), whose sum is σ = 146301792. Its totient is φ = 46891200.

The previous prime is 87921371. The next prime is 87921377. The reversal of 87921375 is 57312978.

It is not a de Polignac number, because 87921375 - 2² = 87921371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87921371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116854 + ... + 117603.

It is an arithmetic number, because the mean of its divisors is an integer number (9143862).

Almost surely, 2^87921375 is an apocalyptic number.

87921375 is a deficient number, since it is larger than the sum of its proper divisors (58380417).

87921375 is a wasteful number, since it uses less digits than its factorization.

87921375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234475 (or 234465 counting only the distinct ones).

The product of its digits is 105840, while the sum is 42.

The square root of 87921375 is about 9376.6398565798. The cubic root of 87921375 is about 444.6635086156.

The spelling of 87921375 in words is "eighty-seven million, nine hundred twenty-one thousand, three hundred seventy-five".