77443440434 has 4 divisors (see below), whose sum is σ = 116165160654. Its totient is φ = 38721720216.

The previous prime is 77443440433. The next prime is 77443440443. The reversal of 77443440434 is 43404434477.

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., 77275660225 + 167780209 = 277985^2 + 12953^2 .

It is a super-2 number, since 2×77443440434² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77443440433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19360860107 + ... + 19360860110.

Almost surely, 2^77443440434 is an apocalyptic number.

77443440434 is a deficient number, since it is larger than the sum of its proper divisors (38721720220).

77443440434 is a wasteful number, since it uses less digits than its factorization.

77443440434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38721720219.

The product of its (nonzero) digits is 1806336, while the sum is 44.

The spelling of 77443440434 in words is "seventy-seven billion, four hundred forty-three million, four hundred forty thousand, four hundred thirty-four".