87199020 has 36 divisors (see below), whose sum is σ = 264504240. Its totient is φ = 23253024.

The previous prime is 87198997. The next prime is 87199031. The reversal of 87199020 is 2099178.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 242040 + ... + 242399.

It is an arithmetic number, because the mean of its divisors is an integer number (7347340).

Almost surely, 2^87199020 is an apocalyptic number.

It is an amenable number.

87199020 is an abundant number, since it is smaller than the sum of its proper divisors (177305220).

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

87199020 is a wasteful number, since it uses less digits than its factorization.

87199020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484454 (or 484449 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 87199020 is about 9338.0415505608. The cubic root of 87199020 is about 443.4423849671.

The spelling of 87199020 in words is "eighty-seven million, one hundred ninety-nine thousand, twenty".