78090877 has 8 divisors (see below), whose sum is σ = 83504952. Its totient is φ = 72768000.

The previous prime is 78090871. The next prime is 78090899. The reversal of 78090877 is 77809087.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18198756 + 59892121 = 4266^2 + 7739^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78090877 - 2¹⁵ = 78058109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78090871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21024 + ... + 24457.

It is an arithmetic number, because the mean of its divisors is an integer number (10438119).

Almost surely, 2^78090877 is an apocalyptic number.

It is an amenable number.

78090877 is a deficient number, since it is larger than the sum of its proper divisors (5414075).

78090877 is a wasteful number, since it uses less digits than its factorization.

78090877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45599.

The product of its (nonzero) digits is 197568, while the sum is 46.

The square root of 78090877 is about 8836.9042656351. The cubic root of 78090877 is about 427.4317381289.

The spelling of 78090877 in words is "seventy-eight million, ninety thousand, eight hundred seventy-seven".