77469869 has 4 divisors (see below), whose sum is σ = 79359420. Its totient is φ = 75580320.

The previous prime is 77469857. The next prime is 77469871. The reversal of 77469869 is 96896477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96896477 = 73 ⋅1327349.

It can be written as a sum of positive squares in 2 ways, for example, as 7496644 + 69973225 = 2738^2 + 8365^2 .

It is a cyclic number.

It is not a de Polignac number, because 77469869 - 2⁴ = 77469853 is a prime.

It is a super-2 number, since 2×77469869² = 12003161205754322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77469809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 944714 + ... + 944795.

It is an arithmetic number, because the mean of its divisors is an integer number (19839855).

Almost surely, 2^77469869 is an apocalyptic number.

It is an amenable number.

77469869 is a deficient number, since it is larger than the sum of its proper divisors (1889551).

77469869 is a wasteful number, since it uses less digits than its factorization.

77469869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889550.

The product of its digits is 4572288, while the sum is 56.

The square root of 77469869 is about 8801.6969386590. The cubic root of 77469869 is about 426.2956887527.

The spelling of 77469869 in words is "seventy-seven million, four hundred sixty-nine thousand, eight hundred sixty-nine".