77643674 has 4 divisors (see below), whose sum is σ = 116465514. Its totient is φ = 38821836.

The previous prime is 77643673. The next prime is 77643721. The reversal of 77643674 is 47634677.

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

It can be written as a sum of positive squares in only one way, i.e., 58415449 + 19228225 = 7643^2 + 4385^2 .

It is a super-2 number, since 2×77643674² = 12057080224436552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77643673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19410917 + ... + 19410920.

Almost surely, 2^77643674 is an apocalyptic number.

77643674 is a deficient number, since it is larger than the sum of its proper divisors (38821840).

77643674 is a wasteful number, since it uses less digits than its factorization.

77643674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38821839.

The product of its digits is 592704, while the sum is 44.

The square root of 77643674 is about 8811.5647872554. The cubic root of 77643674 is about 426.6142512380.

The spelling of 77643674 in words is "seventy-seven million, six hundred forty-three thousand, six hundred seventy-four".