77349869 has 6 divisors (see below), whose sum is σ = 79498314. Its totient is φ = 75258000.

The previous prime is 77349863. The next prime is 77349871. The reversal of 77349869 is 96894377.

It can be written as a sum of positive squares in 3 ways, for example, as 29214025 + 48135844 = 5405^2 + 6938^2 .

It is not a de Polignac number, because 77349869 - 2¹² = 77345773 is a prime.

It is a super-2 number, since 2×77349869² = 11966004468634322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77349869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77349863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26882 + ... + 29619.

It is an arithmetic number, because the mean of its divisors is an integer number (13249719).

Almost surely, 2^77349869 is an apocalyptic number.

It is an amenable number.

77349869 is a deficient number, since it is larger than the sum of its proper divisors (2148445).

77349869 is an equidigital number, since it uses as much as digits as its factorization.

77349869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56575 (or 56538 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 53.

The square root of 77349869 is about 8794.8774295041. The cubic root of 77349869 is about 426.0754658490.

The spelling of 77349869 in words is "seventy-seven million, three hundred forty-nine thousand, eight hundred sixty-nine".