68178890 has 16 divisors (see below), whose sum is σ = 132162408. Its totient is φ = 25173696.

The previous prime is 68178883. The next prime is 68178911. The reversal of 68178890 is 9887186.

It can be written as a sum of positive squares in 4 ways, for example, as 50395801 + 17783089 = 7099^2 + 4217^2 .

It is a super-2 number, since 2×68178890² = 9296722083264200, which contains 22 as substring.

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, 262097 + ... + 262356.

Almost surely, 2^68178890 is an apocalyptic number.

68178890 is a deficient number, since it is larger than the sum of its proper divisors (63983518).

68178890 is a wasteful number, since it uses less digits than its factorization.

68178890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524473.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 68178890 is about 8257.0509263296. The cubic root of 68178890 is about 408.5231219187.

The spelling of 68178890 in words is "sixty-eight million, one hundred seventy-eight thousand, eight hundred ninety".