87099819 has 16 divisors (see below), whose sum is σ = 123396480. Its totient is φ = 54492480.

The previous prime is 87099809. The next prime is 87099821. The reversal of 87099819 is 91899078.

It is not a de Polignac number, because 87099819 - 2¹¹ = 87097771 is a prime.

It is a super-2 number, since 2×87099819² = 15172756939665522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87099809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1042 + ... + 13239.

It is an arithmetic number, because the mean of its divisors is an integer number (7712280).

Almost surely, 2^87099819 is an apocalyptic number.

87099819 is a deficient number, since it is larger than the sum of its proper divisors (36296661).

87099819 is a wasteful number, since it uses less digits than its factorization.

87099819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14410.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 87099819 is about 9332.7283792040. The cubic root of 87099819 is about 443.2741620515.

It can be divided in two parts, 8709 and 9819, that added together give a triangular number (18528 = T₁₉₂).

The spelling of 87099819 in words is "eighty-seven million, ninety-nine thousand, eight hundred nineteen".