89987720 has 16 divisors (see below), whose sum is σ = 202472460. Its totient is φ = 35995072.

The previous prime is 89987719. The next prime is 89987747. The reversal of 89987720 is 2778998.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 89832484 + 155236 = 9478^2 + 394^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124807 + ... + 1124886.

Almost surely, 2^89987720 is an apocalyptic number.

It is an amenable number.

89987720 is an abundant number, since it is smaller than the sum of its proper divisors (112484740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

89987720 is a wasteful number, since it uses less digits than its factorization.

89987720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249704 (or 2249700 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 89987720 is about 9486.1857455987. The cubic root of 89987720 is about 448.1200916359.

The spelling of 89987720 in words is "eighty-nine million, nine hundred eighty-seven thousand, seven hundred twenty".