87499999 has 4 divisors (see below), whose sum is σ = 88317864. Its totient is φ = 86682136.

The previous prime is 87499967. The next prime is 87500029. The reversal of 87499999 is 99999478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99999478 = 2 ⋅49999739.

It is a cyclic number.

It is not a de Polignac number, because 87499999 - 2⁵ = 87499967 is a prime.

It is a Duffinian number.

87499999 is a modest number, since divided by 9999 gives 8749 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 87499999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87499499) 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, 408772 + ... + 408985.

It is an arithmetic number, because the mean of its divisors is an integer number (22079466).

Almost surely, 2^87499999 is an apocalyptic number.

87499999 is a deficient number, since it is larger than the sum of its proper divisors (817865).

87499999 is a wasteful number, since it uses less digits than its factorization.

87499999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817864.

The product of its digits is 13226976, while the sum is 64.

The square root of 87499999 is about 9354.1434134826. The cubic root of 87499999 is about 443.9519991801.

The spelling of 87499999 in words is "eighty-seven million, four hundred ninety-nine thousand, nine hundred ninety-nine".