68877761 has 4 divisors (see below), whose sum is σ = 72929412. Its totient is φ = 64826112.

The previous prime is 68877749. The next prime is 68877773. The reversal of 68877761 is 16777886.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (68877749) and next prime (68877773).

It can be written as a sum of positive squares in 2 ways, for example, as 47348161 + 21529600 = 6881^2 + 4640^2 .

It is a cyclic number.

It is not a de Polignac number, because 68877761 - 2²² = 64683457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68877661) 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, 2025800 + ... + 2025833.

It is an arithmetic number, because the mean of its divisors is an integer number (18232353).

Almost surely, 2^68877761 is an apocalyptic number.

It is an amenable number.

68877761 is a deficient number, since it is larger than the sum of its proper divisors (4051651).

68877761 is a wasteful number, since it uses less digits than its factorization.

68877761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4051650.

The product of its digits is 790272, while the sum is 50.

The square root of 68877761 is about 8299.2626780938. The cubic root of 68877761 is about 409.9142414328.

The spelling of 68877761 in words is "sixty-eight million, eight hundred seventy-seven thousand, seven hundred sixty-one".