69879990 has 32 divisors (see below), whose sum is σ = 171805536. Its totient is φ = 18179840.

The previous prime is 69879959. The next prime is 69880007. The reversal of 69879990 is 9997896.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 69879990.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27177 + ... + 29636.

It is an arithmetic number, because the mean of its divisors is an integer number (5368923).

Almost surely, 2^69879990 is an apocalyptic number.

69879990 is an abundant number, since it is smaller than the sum of its proper divisors (101925546).

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

69879990 is a wasteful number, since it uses less digits than its factorization.

69879990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56864.

The product of its (nonzero) digits is 2204496, while the sum is 57.

The square root of 69879990 is about 8359.4252194753. The cubic root of 69879990 is about 411.8928736152.

The spelling of 69879990 in words is "sixty-nine million, eight hundred seventy-nine thousand, nine hundred ninety".