77728726 has 8 divisors (see below), whose sum is σ = 123451560. Its totient is φ = 36578208.

The previous prime is 77728723. The next prime is 77728733. The reversal of 77728726 is 62782777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77728723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1143036 + ... + 1143103.

It is an arithmetic number, because the mean of its divisors is an integer number (15431445).

Almost surely, 2^77728726 is an apocalyptic number.

77728726 is a deficient number, since it is larger than the sum of its proper divisors (45722834).

77728726 is a wasteful number, since it uses less digits than its factorization.

77728726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286158.

The product of its digits is 460992, while the sum is 46.

The square root of 77728726 is about 8816.3896238767. The cubic root of 77728726 is about 426.7699675278.

The spelling of 77728726 in words is "seventy-seven million, seven hundred twenty-eight thousand, seven hundred twenty-six".