77072669 has 2 divisors, whose sum is σ = 77072670. Its totient is φ = 77072668.

The previous prime is 77072663. The next prime is 77072687. The reversal of 77072669 is 96627077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58323769 + 18748900 = 7637^2 + 4330^2 .

It is an emirp because it is prime and its reverse (96627077) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77072669 is a prime.

It is a super-2 number, since 2×77072669² = 11880392613567122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77072663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38536334 + 38536335.

It is an arithmetic number, because the mean of its divisors is an integer number (38536335).

Almost surely, 2^77072669 is an apocalyptic number.

It is an amenable number.

77072669 is a deficient number, since it is larger than the sum of its proper divisors (1).

77072669 is an equidigital number, since it uses as much as digits as its factorization.

77072669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 222264, while the sum is 44.

The square root of 77072669 is about 8779.1041114683. The cubic root of 77072669 is about 425.5658787357.

The spelling of 77072669 in words is "seventy-seven million, seventy-two thousand, six hundred sixty-nine".