76674781 has 2 divisors, whose sum is σ = 76674782. Its totient is φ = 76674780.

The previous prime is 76674779. The next prime is 76674799. The reversal of 76674781 is 18747667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75846681 + 828100 = 8709^2 + 910^2 .

It is a cyclic number.

It is not a de Polignac number, because 76674781 - 2¹ = 76674779 is a prime.

It is a super-2 number, since 2×76674781² = 11758044082795922, which contains 22 as substring.

Together with 76674779, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76674701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38337390 + 38337391.

It is an arithmetic number, because the mean of its divisors is an integer number (38337391).

Almost surely, 2^76674781 is an apocalyptic number.

76674781 is the 4681-st centered heptagonal number.

It is an amenable number.

76674781 is a deficient number, since it is larger than the sum of its proper divisors (1).

76674781 is an equidigital number, since it uses as much as digits as its factorization.

76674781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 46.

The square root of 76674781 is about 8756.4137065353. The cubic root of 76674781 is about 424.8322863053.

The spelling of 76674781 in words is "seventy-six million, six hundred seventy-four thousand, seven hundred eighty-one".