77690643 has 4 divisors (see below), whose sum is σ = 103587528. Its totient is φ = 51793760.

The previous prime is 77690621. The next prime is 77690647. The reversal of 77690643 is 34609677.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77690643 - 2⁵ = 77690611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77690595 and 77690604.

It is not an unprimeable number, because it can be changed into a prime (77690647) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 12948438 + ... + 12948443.

It is an arithmetic number, because the mean of its divisors is an integer number (25896882).

Almost surely, 2^77690643 is an apocalyptic number.

77690643 is a deficient number, since it is larger than the sum of its proper divisors (25896885).

77690643 is a wasteful number, since it uses less digits than its factorization.

77690643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25896884.

The product of its (nonzero) digits is 190512, while the sum is 42.

The square root of 77690643 is about 8814.2295749544. The cubic root of 77690643 is about 426.7002578398.

It can be divided in two parts, 776 and 90643, that added together give a palindrome (91419).

The spelling of 77690643 in words is "seventy-seven million, six hundred ninety thousand, six hundred forty-three".