68557778 has 16 divisors (see below), whose sum is σ = 105468696. Its totient is φ = 33411840.

The previous prime is 68557763. The next prime is 68557793. The reversal of 68557778 is 87775586.

It is an interprime number because it is at equal distance from previous prime (68557763) and next prime (68557793).

It can be written as a sum of positive squares in 4 ways, for example, as 23493409 + 45064369 = 4847^2 + 6713^2 .

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, 11300 + ... + 16272.

Almost surely, 2^68557778 is an apocalyptic number.

68557778 is a deficient number, since it is larger than the sum of its proper divisors (36910918).

68557778 is a wasteful number, since it uses less digits than its factorization.

68557778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5149.

The product of its digits is 3292800, while the sum is 53.

The square root of 68557778 is about 8279.9624395283. The cubic root of 68557778 is about 409.2784811632.

The spelling of 68557778 in words is "sixty-eight million, five hundred fifty-seven thousand, seven hundred seventy-eight".