77631806 has 16 divisors (see below), whose sum is σ = 133300320. Its totient is φ = 33216480.

The previous prime is 77631793. The next prime is 77631839. The reversal of 77631806 is 60813677.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77631806.

It is a congruent number.

It is an unprimeable number.

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, 5060 + ... + 13448.

It is an arithmetic number, because the mean of its divisors is an integer number (8331270).

Almost surely, 2^77631806 is an apocalyptic number.

77631806 is a deficient number, since it is larger than the sum of its proper divisors (55668514).

77631806 is a wasteful number, since it uses less digits than its factorization.

77631806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9059.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 77631806 is about 8810.8913283504. The cubic root of 77631806 is about 426.5925138331.

The spelling of 77631806 in words is "seventy-seven million, six hundred thirty-one thousand, eight hundred six".