68402691 has 16 divisors (see below), whose sum is σ = 115814400. Its totient is φ = 39087144.

The previous prime is 68402689. The next prime is 68402693. The reversal of 68402691 is 19620486.

It is an interprime number because it is at equal distance from previous prime (68402689) and next prime (68402693).

It is not a de Polignac number, because 68402691 - 2¹ = 68402689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68402693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180771 + ... + 181148.

It is an arithmetic number, because the mean of its divisors is an integer number (7238400).

Almost surely, 2^68402691 is an apocalyptic number.

68402691 is a deficient number, since it is larger than the sum of its proper divisors (47411709).

68402691 is a wasteful number, since it uses less digits than its factorization.

68402691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361935 (or 361929 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 68402691 is about 8270.5919377031. The cubic root of 68402691 is about 408.9696336675.

The spelling of 68402691 in words is "sixty-eight million, four hundred two thousand, six hundred ninety-one".