77343640 has 32 divisors (see below), whose sum is σ = 189844560. Its totient is φ = 28124800.

The previous prime is 77343619. The next prime is 77343647. The reversal of 77343640 is 4634377.

It is a junction number, because it is equal to n+sod(n) for n = 77343596 and 77343605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77343647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87451 + ... + 88330.

Almost surely, 2^77343640 is an apocalyptic number.

It is an amenable number.

77343640 is an abundant number, since it is smaller than the sum of its proper divisors (112500920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77343640 is a wasteful number, since it uses less digits than its factorization.

77343640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175803 (or 175799 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 34.

The square root of 77343640 is about 8794.5232957790. The cubic root of 77343640 is about 426.0640282286.

The spelling of 77343640 in words is "seventy-seven million, three hundred forty-three thousand, six hundred forty".