77309745 has 8 divisors (see below), whose sum is σ = 123695616. Its totient is φ = 41231856.

The previous prime is 77309719. The next prime is 77309773. The reversal of 77309745 is 54790377.

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

It is not a de Polignac number, because 77309745 - 2¹² = 77305649 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 77309697 and 77309706.

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, 2576977 + ... + 2577006.

It is an arithmetic number, because the mean of its divisors is an integer number (15461952).

Almost surely, 2^77309745 is an apocalyptic number.

It is an amenable number.

77309745 is a deficient number, since it is larger than the sum of its proper divisors (46385871).

77309745 is a wasteful number, since it uses less digits than its factorization.

77309745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5153991.

The product of its (nonzero) digits is 185220, while the sum is 42.

The square root of 77309745 is about 8792.5960330269. The cubic root of 77309745 is about 426.0017798422.

The spelling of 77309745 in words is "seventy-seven million, three hundred nine thousand, seven hundred forty-five".