140686668 has 18 divisors (see below), whose sum is σ = 355624724. Its totient is φ = 46895544.

The previous prime is 140686657. The next prime is 140686681. The reversal of 140686668 is 866686041.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1953946 + ... + 1954017.

Almost surely, 2^140686668 is an apocalyptic number.

140686668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

140686668 is an abundant number, since it is smaller than the sum of its proper divisors (214938056).

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

140686668 is a wasteful number, since it uses less digits than its factorization.

140686668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3907973 (or 3907968 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 140686668 is about 11861.1410918174. The cubic root of 140686668 is about 520.0969592374.

It can be divided in two parts, 14068 and 6668, that added together give a 4-th power (20736 = 12⁴).

The spelling of 140686668 in words is "one hundred forty million, six hundred eighty-six thousand, six hundred sixty-eight".