77487 has 8 divisors (see below), whose sum is σ = 107904. Its totient is φ = 49368.

The previous prime is 77479. The next prime is 77489. The reversal of 77487 is 78477.

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

It is not a de Polignac number, because 77487 - 2³ = 77479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493 + ... + 630.

It is an arithmetic number, because the mean of its divisors is an integer number (13488).

2⁷⁷⁴⁸⁷ is an apocalyptic number.

77487 is a deficient number, since it is larger than the sum of its proper divisors (30417).

77487 is a wasteful number, since it uses less digits than its factorization.

77487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149.

The product of its digits is 10976, while the sum is 33.

The square root of 77487 is about 278.3648684730. The cubic root of 77487 is about 42.6327108853.

Subtracting 77487 from its reverse (78477), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 774 and 87, that added together give a triangular number (861 = T₄₁).

The spelling of 77487 in words is "seventy-seven thousand, four hundred eighty-seven".