77856745 has 16 divisors (see below), whose sum is σ = 96018048. Its totient is φ = 60568960.

The previous prime is 77856743. The next prime is 77856767. The reversal of 77856745 is 54765877.

It is a happy number.

It is not a de Polignac number, because 77856745 - 2¹ = 77856743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77856743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120012 + ... + 120658.

It is an arithmetic number, because the mean of its divisors is an integer number (6001128).

Almost surely, 2^77856745 is an apocalyptic number.

It is an amenable number.

77856745 is a deficient number, since it is larger than the sum of its proper divisors (18161303).

77856745 is a wasteful number, since it uses less digits than its factorization.

77856745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280.

The product of its digits is 1646400, while the sum is 49.

The square root of 77856745 is about 8823.6469217665. The cubic root of 77856745 is about 427.0041353416.

The spelling of 77856745 in words is "seventy-seven million, eight hundred fifty-six thousand, seven hundred forty-five".