68257780 has 24 divisors (see below), whose sum is σ = 145693800. Its totient is φ = 26855040.

The previous prime is 68257759. The next prime is 68257781. The reversal of 68257780 is 8775286.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 820836 + 67436944 = 906^2 + 8212^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68257781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26755 + ... + 29194.

It is an arithmetic number, because the mean of its divisors is an integer number (6070575).

Almost surely, 2^68257780 is an apocalyptic number.

It is an amenable number.

68257780 is an abundant number, since it is smaller than the sum of its proper divisors (77436020).

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

68257780 is a wasteful number, since it uses less digits than its factorization.

68257780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56019 (or 56017 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 68257780 is about 8261.8266745315. The cubic root of 68257780 is about 408.6806289640.

The spelling of 68257780 in words is "sixty-eight million, two hundred fifty-seven thousand, seven hundred eighty".