68640746 has 8 divisors (see below), whose sum is σ = 103143780. Its totient is φ = 34259488.

The previous prime is 68640739. The next prime is 68640769. The reversal of 68640746 is 64704686.

It can be written as a sum of positive squares in 2 ways, for example, as 50908225 + 17732521 = 7135^2 + 4211^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×68640746³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29021 + ... + 31296.

Almost surely, 2^68640746 is an apocalyptic number.

68640746 is a deficient number, since it is larger than the sum of its proper divisors (34503034).

68640746 is a wasteful number, since it uses less digits than its factorization.

68640746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60888.

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 68640746 is about 8284.9710922851. The cubic root of 68640746 is about 409.4435163061.

The spelling of 68640746 in words is "sixty-eight million, six hundred forty thousand, seven hundred forty-six".