87904489 has 4 divisors (see below), whose sum is σ = 90280324. Its totient is φ = 85528656.

The previous prime is 87904471. The next prime is 87904511. The reversal of 87904489 is 98440978.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98440978 = 2 ⋅49220489.

It can be written as a sum of positive squares in 2 ways, for example, as 71233600 + 16670889 = 8440^2 + 4083^2 .

It is a cyclic number.

It is not a de Polignac number, because 87904489 - 2¹³ = 87896297 is a prime.

It is a super-2 number, since 2×87904489² = 15454398372702242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87904409) 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, 1187862 + ... + 1187935.

It is an arithmetic number, because the mean of its divisors is an integer number (22570081).

Almost surely, 2^87904489 is an apocalyptic number.

It is an amenable number.

87904489 is a deficient number, since it is larger than the sum of its proper divisors (2375835).

87904489 is a wasteful number, since it uses less digits than its factorization.

87904489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375834.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 87904489 is about 9375.7393841766. The cubic root of 87904489 is about 444.6350397373.

The spelling of 87904489 in words is "eighty-seven million, nine hundred four thousand, four hundred eighty-nine".