77820632 has 8 divisors (see below), whose sum is σ = 145913700. Its totient is φ = 38910312.

The previous prime is 77820629. The next prime is 77820641. The reversal of 77820632 is 23602877.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 77820592 and 77820601.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4863782 + ... + 4863797.

Almost surely, 2^77820632 is an apocalyptic number.

It is an amenable number.

77820632 is a deficient number, since it is larger than the sum of its proper divisors (68093068).

77820632 is a wasteful number, since it uses less digits than its factorization.

77820632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9727585 (or 9727581 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 77820632 is about 8821.6003083341. The cubic root of 77820632 is about 426.9381047314.

The spelling of 77820632 in words is "seventy-seven million, eight hundred twenty thousand, six hundred thirty-two".