87861993 has 8 divisors (see below), whose sum is σ = 117346656. Its totient is φ = 58476000.

The previous prime is 87861989. The next prime is 87862007. The reversal of 87861993 is 39916878.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87861993 - 2² = 87861989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87861913) 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, 22563 + ... + 26168.

It is an arithmetic number, because the mean of its divisors is an integer number (14668332).

Almost surely, 2^87861993 is an apocalyptic number.

It is an amenable number.

87861993 is a deficient number, since it is larger than the sum of its proper divisors (29484663).

87861993 is a wasteful number, since it uses less digits than its factorization.

87861993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49335.

The product of its digits is 653184, while the sum is 51.

The square root of 87861993 is about 9373.4728356143. The cubic root of 87861993 is about 444.5633776545.

The spelling of 87861993 in words is "eighty-seven million, eight hundred sixty-one thousand, nine hundred ninety-three".