77643742 has 16 divisors (see below), whose sum is σ = 127378800. Its totient is φ = 35202240.

The previous prime is 77643739. The next prime is 77643757. The reversal of 77643742 is 24734677.

It is a junction number, because it is equal to n+sod(n) for n = 77643695 and 77643704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4684 + ... + 13312.

It is an arithmetic number, because the mean of its divisors is an integer number (7961175).

Almost surely, 2^77643742 is an apocalyptic number.

77643742 is a deficient number, since it is larger than the sum of its proper divisors (49735058).

77643742 is a wasteful number, since it uses less digits than its factorization.

77643742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9051.

The product of its digits is 197568, while the sum is 40.

The square root of 77643742 is about 8811.5686458201. The cubic root of 77643742 is about 426.6143757802.

The spelling of 77643742 in words is "seventy-seven million, six hundred forty-three thousand, seven hundred forty-two".