77347631 has 4 divisors (see below), whose sum is σ = 77394600. Its totient is φ = 77300664.

The previous prime is 77347609. The next prime is 77347663. The reversal of 77347631 is 13674377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13674377 = 109 ⋅125453.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77347631 is a prime.

It is a super-2 number, since 2×77347631² = 11965312042624322, 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 (77347531) 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, 20921 + ... + 24338.

It is an arithmetic number, because the mean of its divisors is an integer number (19348650).

Almost surely, 2^77347631 is an apocalyptic number.

77347631 is a deficient number, since it is larger than the sum of its proper divisors (46969).

77347631 is a wasteful number, since it uses less digits than its factorization.

77347631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46968.

The product of its digits is 74088, while the sum is 38.

The square root of 77347631 is about 8794.7501954291. The cubic root of 77347631 is about 426.0713565290.

The spelling of 77347631 in words is "seventy-seven million, three hundred forty-seven thousand, six hundred thirty-one".