77656873 has 4 divisors (see below), whose sum is σ = 88750720. Its totient is φ = 66563028.

The previous prime is 77656871. The next prime is 77656897. The reversal of 77656873 is 37865677.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37865677 = 29 ⋅1305713.

It is not a de Polignac number, because 77656873 - 2¹ = 77656871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77656871) 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, 5546913 + ... + 5546926.

It is an arithmetic number, because the mean of its divisors is an integer number (22187680).

Almost surely, 2^77656873 is an apocalyptic number.

It is an amenable number.

77656873 is a deficient number, since it is larger than the sum of its proper divisors (11093847).

77656873 is a wasteful number, since it uses less digits than its factorization.

77656873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11093846.

The product of its digits is 1481760, while the sum is 49.

The square root of 77656873 is about 8812.3137143431. The cubic root of 77656873 is about 426.6384238982.

The spelling of 77656873 in words is "seventy-seven million, six hundred fifty-six thousand, eight hundred seventy-three".