68977613 has 4 divisors (see below), whose sum is σ = 69440700. Its totient is φ = 68514528.

The previous prime is 68977609. The next prime is 68977651. The reversal of 68977613 is 31677986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31677986 = 2 ⋅15838993.

It can be written as a sum of positive squares in 2 ways, for example, as 33895684 + 35081929 = 5822^2 + 5923^2 .

It is a cyclic number.

It is not a de Polignac number, because 68977613 - 2² = 68977609 is a prime.

It is a super-2 number, since 2×68977613² = 9515822190355538, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68977603) 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, 231320 + ... + 231617.

It is an arithmetic number, because the mean of its divisors is an integer number (17360175).

Almost surely, 2^68977613 is an apocalyptic number.

It is an amenable number.

68977613 is a deficient number, since it is larger than the sum of its proper divisors (463087).

68977613 is a wasteful number, since it uses less digits than its factorization.

68977613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463086.

The product of its digits is 381024, while the sum is 47.

The square root of 68977613 is about 8305.2762145518. The cubic root of 68977613 is about 410.1122298356.

The spelling of 68977613 in words is "sixty-eight million, nine hundred seventy-seven thousand, six hundred thirteen".