77969669 has 2 divisors, whose sum is σ = 77969670. Its totient is φ = 77969668.

The previous prime is 77969657. The next prime is 77969699. The reversal of 77969669 is 96696977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42745444 + 35224225 = 6538^2 + 5935^2 .

It is a cyclic number.

It is not a de Polignac number, because 77969669 - 2¹⁶ = 77904133 is a prime.

It is a super-2 number, since 2×77969669² = 12158538567939122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77969629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38984834 + 38984835.

It is an arithmetic number, because the mean of its divisors is an integer number (38984835).

Almost surely, 2^77969669 is an apocalyptic number.

It is an amenable number.

77969669 is a deficient number, since it is larger than the sum of its proper divisors (1).

77969669 is an equidigital number, since it uses as much as digits as its factorization.

77969669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7715736, while the sum is 59.

The square root of 77969669 is about 8830.0435446265. The cubic root of 77969669 is about 427.2104789339.

The spelling of 77969669 in words is "seventy-seven million, nine hundred sixty-nine thousand, six hundred sixty-nine".