77671487 has 16 divisors (see below), whose sum is σ = 87091200. Its totient is φ = 68837760.

The previous prime is 77671481. The next prime is 77671493. The reversal of 77671487 is 78417677.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77671481) and next prime (77671493).

It is not a de Polignac number, because 77671487 - 2⁴ = 77671471 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 (77671481) 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 15 ways as a sum of consecutive naturals, for example, 61064 + ... + 62322.

It is an arithmetic number, because the mean of its divisors is an integer number (5443200).

Almost surely, 2^77671487 is an apocalyptic number.

77671487 is a deficient number, since it is larger than the sum of its proper divisors (9419713).

77671487 is a wasteful number, since it uses less digits than its factorization.

77671487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486.

The product of its digits is 460992, while the sum is 47.

The square root of 77671487 is about 8813.1428559850. The cubic root of 77671487 is about 426.6651847957.

The spelling of 77671487 in words is "seventy-seven million, six hundred seventy-one thousand, four hundred eighty-seven".