77813457 has 8 divisors (see below), whose sum is σ = 103939776. Its totient is φ = 51781392.

The previous prime is 77813453. The next prime is 77813521. The reversal of 77813457 is 75431877.

It is a happy number.

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

It is not a de Polignac number, because 77813457 - 2² = 77813453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77813453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21613 + ... + 24954.

It is an arithmetic number, because the mean of its divisors is an integer number (12992472).

Almost surely, 2^77813457 is an apocalyptic number.

It is an amenable number.

77813457 is a deficient number, since it is larger than the sum of its proper divisors (26126319).

77813457 is a wasteful number, since it uses less digits than its factorization.

77813457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47127.

The product of its digits is 164640, while the sum is 42.

The square root of 77813457 is about 8821.1936267152. The cubic root of 77813457 is about 426.9249832109.

The spelling of 77813457 in words is "seventy-seven million, eight hundred thirteen thousand, four hundred fifty-seven".