87042991 has 8 divisors (see below), whose sum is σ = 99800064. Its totient is φ = 74366520.

The previous prime is 87042973. The next prime is 87042997. The reversal of 87042991 is 19924078.

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

It is a cyclic number.

It is not a de Polignac number, because 87042991 - 2⁹ = 87042479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87042997) 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, 17815 + ... + 22168.

It is an arithmetic number, because the mean of its divisors is an integer number (12475008).

Almost surely, 2^87042991 is an apocalyptic number.

87042991 is a deficient number, since it is larger than the sum of its proper divisors (12757073).

87042991 is a wasteful number, since it uses less digits than its factorization.

87042991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40301.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 87042991 is about 9329.6833279592. The cubic root of 87042991 is about 443.1777368051.

The spelling of 87042991 in words is "eighty-seven million, forty-two thousand, nine hundred ninety-one".