77086387 has 4 divisors (see below), whose sum is σ = 88098736. Its totient is φ = 66074040.

The previous prime is 77086357. The next prime is 77086403. The reversal of 77086387 is 78368077.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78368077 = 283 ⋅276919.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77086387 is a prime.

It is a super-2 number, since 2×77086387² = 11884622121427538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77086357) 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, 5506164 + ... + 5506177.

It is an arithmetic number, because the mean of its divisors is an integer number (22024684).

Almost surely, 2^77086387 is an apocalyptic number.

77086387 is a deficient number, since it is larger than the sum of its proper divisors (11012349).

77086387 is a wasteful number, since it uses less digits than its factorization.

77086387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11012348.

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 77086387 is about 8779.8853637163. The cubic root of 77086387 is about 425.5911257589.

It can be divided in two parts, 7708638 and 7, that multiplied together give a triangular number (53960466 = T₁₀₃₈₈).

The spelling of 77086387 in words is "seventy-seven million, eighty-six thousand, three hundred eighty-seven".