77087 has 4 divisors (see below), whose sum is σ = 77736. Its totient is φ = 76440.

The previous prime is 77081. The next prime is 77093. The reversal of 77087 is 78077.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78077 = 163 ⋅479.

It is an interprime number because it is at equal distance from previous prime (77081) and next prime (77093).

It is a cyclic number.

It is not a de Polignac number, because 77087 - 2⁶ = 77023 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 (77081) 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, 89 + ... + 402.

It is an arithmetic number, because the mean of its divisors is an integer number (19434).

2⁷⁷⁰⁸⁷ is an apocalyptic number.

77087 is a deficient number, since it is larger than the sum of its proper divisors (649).

77087 is a wasteful number, since it uses less digits than its factorization.

77087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 77087 is about 277.6454573732. The cubic root of 77087 is about 42.5592253873.

Subtracting 77087 from its reverse (78077), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 7708 and 7, that multiplied together give a triangular number (53956 = T₃₂₈).

The spelling of 77087 in words is "seventy-seven thousand, eighty-seven".