68251720 has 16 divisors (see below), whose sum is σ = 153566460. Its totient is φ = 27300672.

The previous prime is 68251699. The next prime is 68251721. The reversal of 68251720 is 2715286.

It can be written as a sum of positive squares in 2 ways, for example, as 61058596 + 7193124 = 7814^2 + 2682^2 .

It is not an unprimeable number, because it can be changed into a prime (68251721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 853107 + ... + 853186.

Almost surely, 2^68251720 is an apocalyptic number.

It is an amenable number.

68251720 is an abundant number, since it is smaller than the sum of its proper divisors (85314740).

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

68251720 is a wasteful number, since it uses less digits than its factorization.

68251720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706304 (or 1706300 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 68251720 is about 8261.4599194089. The cubic root of 68251720 is about 408.6685342358.

The spelling of 68251720 in words is "sixty-eight million, two hundred fifty-one thousand, seven hundred twenty".