77012857 has 4 divisors (see below), whose sum is σ = 77878260. Its totient is φ = 76147456.

The previous prime is 77012851. The next prime is 77012867. The reversal of 77012857 is 75821077.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10361961 + 66650896 = 3219^2 + 8164^2 .

It is a cyclic number.

It is not a de Polignac number, because 77012857 - 2³ = 77012849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77012851) 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, 432568 + ... + 432745.

It is an arithmetic number, because the mean of its divisors is an integer number (19469565).

Almost surely, 2^77012857 is an apocalyptic number.

It is an amenable number.

77012857 is a deficient number, since it is larger than the sum of its proper divisors (865403).

77012857 is an equidigital number, since it uses as much as digits as its factorization.

77012857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865402.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 77012857 is about 8775.6969523793. The cubic root of 77012857 is about 425.4557638965.

The spelling of 77012857 in words is "seventy-seven million, twelve thousand, eight hundred fifty-seven".