864077890 has 32 divisors (see below), whose sum is σ = 1676542896. Its totient is φ = 318746880.

The previous prime is 864077867. The next prime is 864077897. The reversal of 864077890 is 98770468.

It can be written as a sum of positive squares in 8 ways, for example, as 297114169 + 566963721 = 17237^2 + 23811^2 .

It is not an unprimeable number, because it can be changed into a prime (864077897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177124 + ... + 181936.

Almost surely, 2^864077890 is an apocalyptic number.

864077890 is a deficient number, since it is larger than the sum of its proper divisors (812465006).

864077890 is a wasteful number, since it uses less digits than its factorization.

864077890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6214.

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 864077890 is about 29395.2018193446. The cubic root of 864077890 is about 952.4692513088.

The spelling of 864077890 in words is "eight hundred sixty-four million, seventy-seven thousand, eight hundred ninety".