66968390 has 8 divisors (see below), whose sum is σ = 120543120. Its totient is φ = 26787352.

The previous prime is 66968381. The next prime is 66968399. The reversal of 66968390 is 9386966.

It is an interprime number because it is at equal distance from previous prime (66968381) and next prime (66968399).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66968399) 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, 3348410 + ... + 3348429.

It is an arithmetic number, because the mean of its divisors is an integer number (15067890).

Almost surely, 2^66968390 is an apocalyptic number.

66968390 is a deficient number, since it is larger than the sum of its proper divisors (53574730).

66968390 is a wasteful number, since it uses less digits than its factorization.

66968390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6696846.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 66968390 is about 8183.4216560067. The cubic root of 66968390 is about 406.0909265962.

The spelling of 66968390 in words is "sixty-six million, nine hundred sixty-eight thousand, three hundred ninety".