68820740 has 24 divisors (see below), whose sum is σ = 148431192. Its totient is φ = 26784000.

The previous prime is 68820733. The next prime is 68820757. The reversal of 68820740 is 4702886.

It can be written as a sum of positive squares in 4 ways, for example, as 31561924 + 37258816 = 5618^2 + 6104^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 68820740.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45761 + ... + 47240.

It is an arithmetic number, because the mean of its divisors is an integer number (6184633).

Almost surely, 2^68820740 is an apocalyptic number.

It is an amenable number.

68820740 is an abundant number, since it is smaller than the sum of its proper divisors (79610452).

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

68820740 is a wasteful number, since it uses less digits than its factorization.

68820740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93047 (or 93045 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 68820740 is about 8295.8266616414. The cubic root of 68820740 is about 409.8010932863.

The spelling of 68820740 in words is "sixty-eight million, eight hundred twenty thousand, seven hundred forty".