77136457 has 8 divisors (see below), whose sum is σ = 82454400. Its totient is φ = 71982240.

The previous prime is 77136443. The next prime is 77136487. The reversal of 77136457 is 75463177.

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

It is a cyclic number.

It is not a de Polignac number, because 77136457 - 2¹⁹ = 76612169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77136487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39957 + ... + 41842.

It is an arithmetic number, because the mean of its divisors is an integer number (10306800).

Almost surely, 2^77136457 is an apocalyptic number.

It is an amenable number.

77136457 is a deficient number, since it is larger than the sum of its proper divisors (5317943).

77136457 is a wasteful number, since it uses less digits than its factorization.

77136457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81863.

The product of its digits is 123480, while the sum is 40.

The square root of 77136457 is about 8782.7363048198. The cubic root of 77136457 is about 425.6832506959.

The spelling of 77136457 in words is "seventy-seven million, one hundred thirty-six thousand, four hundred fifty-seven".