77864051 has 4 divisors (see below), whose sum is σ = 77881704. Its totient is φ = 77846400.

The previous prime is 77864009. The next prime is 77864057. The reversal of 77864051 is 15046877.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15046877 = 41 ⋅366997.

It is a cyclic number.

It is not a de Polignac number, because 77864051 - 2²² = 73669747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77863996 and 77864014.

It is not an unprimeable number, because it can be changed into a prime (77864057) 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, 4136 + ... + 13146.

It is an arithmetic number, because the mean of its divisors is an integer number (19470426).

Almost surely, 2^77864051 is an apocalyptic number.

77864051 is a deficient number, since it is larger than the sum of its proper divisors (17653).

77864051 is an equidigital number, since it uses as much as digits as its factorization.

77864051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17652.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 77864051 is about 8824.0609132077. The cubic root of 77864051 is about 427.0174914725.

The spelling of 77864051 in words is "seventy-seven million, eight hundred sixty-four thousand, fifty-one".