87921489 has 8 divisors (see below), whose sum is σ = 117358560. Its totient is φ = 58549376.

The previous prime is 87921451. The next prime is 87921497. The reversal of 87921489 is 98412978.

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 87921489 - 2⁹ = 87920977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87921289) 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, 12987 + ... + 18560.

It is an arithmetic number, because the mean of its divisors is an integer number (14669820).

Almost surely, 2^87921489 is an apocalyptic number.

It is an amenable number.

87921489 is a deficient number, since it is larger than the sum of its proper divisors (29437071).

87921489 is a wasteful number, since it uses less digits than its factorization.

87921489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32479.

The product of its digits is 290304, while the sum is 48.

The square root of 87921489 is about 9376.6459355145. The cubic root of 87921489 is about 444.6637008010.

It can be divided in two parts, 87921 and 489, that added together give a triangular number (88410 = T₄₂₀).

The spelling of 87921489 in words is "eighty-seven million, nine hundred twenty-one thousand, four hundred eighty-nine".