77881633 has 4 divisors (see below), whose sum is σ = 79986580. Its totient is φ = 75776688.

The previous prime is 77881631. The next prime is 77881649. The reversal of 77881633 is 33618877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33618877 = 17 ⋅1977581.

It can be written as a sum of positive squares in 2 ways, for example, as 36626704 + 41254929 = 6052^2 + 6423^2 .

It is a cyclic number.

It is not a de Polignac number, because 77881633 - 2¹ = 77881631 is a prime.

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 77881633.

It is not an unprimeable number, because it can be changed into a prime (77881631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052418 + ... + 1052491.

It is an arithmetic number, because the mean of its divisors is an integer number (19996645).

Almost surely, 2^77881633 is an apocalyptic number.

It is an amenable number.

77881633 is a deficient number, since it is larger than the sum of its proper divisors (2104947).

77881633 is a wasteful number, since it uses less digits than its factorization.

77881633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104946.

The product of its digits is 169344, while the sum is 43.

The square root of 77881633 is about 8825.0571102968. The cubic root of 77881633 is about 427.0496297803.

The spelling of 77881633 in words is "seventy-seven million, eight hundred eighty-one thousand, six hundred thirty-three".