68691584 has 32 divisors (see below), whose sum is σ = 147376740. Its totient is φ = 31703040.

The previous prime is 68691583. The next prime is 68691587. The reversal of 68691584 is 48519686.

It can be written as a sum of positive squares in 2 ways, for example, as 65157184 + 3534400 = 8072^2 + 1880^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (68691583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18977 + ... + 22304.

Almost surely, 2^68691584 is an apocalyptic number.

68691584 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

68691584 is an abundant number, since it is smaller than the sum of its proper divisors (78685156).

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

68691584 is a wasteful number, since it uses less digits than its factorization.

68691584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41308 (or 41296 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 68691584 is about 8288.0386099487. The cubic root of 68691584 is about 409.5445746130.

The spelling of 68691584 in words is "sixty-eight million, six hundred ninety-one thousand, five hundred eighty-four".