77612881 has 2 divisors, whose sum is σ = 77612882. Its totient is φ = 77612880.

The previous prime is 77612783. The next prime is 77612911. The reversal of 77612881 is 18821677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77598481 + 14400 = 8809^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 77612881 - 2¹¹ = 77610833 is a prime.

It is a super-2 number, since 2×77612881² = 12047518594240322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77618881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38806440 + 38806441.

It is an arithmetic number, because the mean of its divisors is an integer number (38806441).

Almost surely, 2^77612881 is an apocalyptic number.

It is an amenable number.

77612881 is a deficient number, since it is larger than the sum of its proper divisors (1).

77612881 is an equidigital number, since it uses as much as digits as its factorization.

77612881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 40.

The square root of 77612881 is about 8809.8173079809. The cubic root of 77612881 is about 426.5578462578.

The spelling of 77612881 in words is "seventy-seven million, six hundred twelve thousand, eight hundred eighty-one".