77611631 has 8 divisors (see below), whose sum is σ = 80285184. Its totient is φ = 74948760.

The previous prime is 77611621. The next prime is 77611643. The reversal of 77611631 is 13611677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77611631 - 2¹⁸ = 77349487 is a prime.

It is a super-2 number, since 2×77611631² = 12047130532960322, 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 (77611621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13820 + ... + 18606.

It is an arithmetic number, because the mean of its divisors is an integer number (10035648).

Almost surely, 2^77611631 is an apocalyptic number.

77611631 is a deficient number, since it is larger than the sum of its proper divisors (2673553).

77611631 is a wasteful number, since it uses less digits than its factorization.

77611631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5341.

The product of its digits is 5292, while the sum is 32.

The square root of 77611631 is about 8809.7463641129. The cubic root of 77611631 is about 426.5555562592. Note that the first 5 decimals are identical.

The spelling of 77611631 in words is "seventy-seven million, six hundred eleven thousand, six hundred thirty-one".