87898521 has 4 divisors (see below), whose sum is σ = 117198032. Its totient is φ = 58599012.

The previous prime is 87898513. The next prime is 87898523. The reversal of 87898521 is 12589878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 87898521 - 2³ = 87898513 is a prime.

It is a super-2 number, since 2×87898521² = 15452299987974882, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87898523) 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, 14649751 + ... + 14649756.

It is an arithmetic number, because the mean of its divisors is an integer number (29299508).

Almost surely, 2^87898521 is an apocalyptic number.

It is an amenable number.

87898521 is a deficient number, since it is larger than the sum of its proper divisors (29299511).

87898521 is a wasteful number, since it uses less digits than its factorization.

87898521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29299510.

The product of its digits is 322560, while the sum is 48.

The square root of 87898521 is about 9375.4211105422. The cubic root of 87898521 is about 444.6249771417.

It can be divided in two parts, 878 and 98521, that added together give a palindrome (99399).

The spelling of 87898521 in words is "eighty-seven million, eight hundred ninety-eight thousand, five hundred twenty-one".