77197487 has 4 divisors (see below), whose sum is σ = 77333256. Its totient is φ = 77061720.

The previous prime is 77197481. The next prime is 77197489. The reversal of 77197487 is 78479177.

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

It is a cyclic number.

It is not a de Polignac number, because 77197487 - 2⁸ = 77197231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77197481) 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, 67028 + ... + 68169.

It is an arithmetic number, because the mean of its divisors is an integer number (19333314).

Almost surely, 2^77197487 is an apocalyptic number.

77197487 is a deficient number, since it is larger than the sum of its proper divisors (135769).

77197487 is a wasteful number, since it uses less digits than its factorization.

77197487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135768.

The product of its digits is 691488, while the sum is 50.

The square root of 77197487 is about 8786.2100475689. The cubic root of 77197487 is about 425.7954872924.

The spelling of 77197487 in words is "seventy-seven million, one hundred ninety-seven thousand, four hundred eighty-seven".