87021887 has 4 divisors (see below), whose sum is σ = 87042120. Its totient is φ = 87001656.

The previous prime is 87021871. The next prime is 87021899. The reversal of 87021887 is 78812078.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78812078 = 2 ⋅39406039.

It is a cyclic number.

It is not a de Polignac number, because 87021887 - 2⁴ = 87021871 is a prime.

It is a super-3 number, since 3×87021887³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87021287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812 + ... + 13217.

It is an arithmetic number, because the mean of its divisors is an integer number (21760530).

Almost surely, 2^87021887 is an apocalyptic number.

87021887 is a deficient number, since it is larger than the sum of its proper divisors (20233).

87021887 is a wasteful number, since it uses less digits than its factorization.

87021887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20232.

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 87021887 is about 9328.5522456596. The cubic root of 87021887 is about 443.1419170382.

The spelling of 87021887 in words is "eighty-seven million, twenty-one thousand, eight hundred eighty-seven".