68761997 has 4 divisors (see below), whose sum is σ = 68856540. Its totient is φ = 68667456.

The previous prime is 68761967. The next prime is 68762003. The reversal of 68761997 is 79916786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79916786 = 2 ⋅39958393.

It can be written as a sum of positive squares in 2 ways, for example, as 66896041 + 1865956 = 8179^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 68761997 - 2⁶ = 68761933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68761907) 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, 46172 + ... + 47637.

It is an arithmetic number, because the mean of its divisors is an integer number (17214135).

Almost surely, 2^68761997 is an apocalyptic number.

It is an amenable number.

68761997 is a deficient number, since it is larger than the sum of its proper divisors (94543).

68761997 is an equidigital number, since it uses as much as digits as its factorization.

68761997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94542.

The product of its digits is 1143072, while the sum is 53.

The square root of 68761997 is about 8292.2853906508. The cubic root of 68761997 is about 409.6844627563.

The spelling of 68761997 in words is "sixty-eight million, seven hundred sixty-one thousand, nine hundred ninety-seven".