87492309 has 16 divisors (see below), whose sum is σ = 120314688. Its totient is φ = 56512512.

The previous prime is 87492289. The next prime is 87492311. The reversal of 87492309 is 90329478.

It is not a de Polignac number, because 87492309 - 2²⁰ = 86443733 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87492329) 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, 26994 + ... + 30060.

It is an arithmetic number, because the mean of its divisors is an integer number (7519668).

Almost surely, 2^87492309 is an apocalyptic number.

It is an amenable number.

87492309 is a deficient number, since it is larger than the sum of its proper divisors (32822379).

87492309 is a wasteful number, since it uses less digits than its factorization.

87492309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 87492309 is about 9353.7323566585. The cubic root of 87492309 is about 443.9389931194.

The spelling of 87492309 in words is "eighty-seven million, four hundred ninety-two thousand, three hundred nine".