864772 has 12 divisors (see below), whose sum is σ = 1550556. Its totient is φ = 421760.

The previous prime is 864757. The next prime is 864781. The reversal of 864772 is 277468.

It can be written as a sum of positive squares in 2 ways, for example, as 198916 + 665856 = 446^2 + 816^2 .

It is a super-2 number, since 2×864772² = 1495661223968, which contains 22 as substring.

It is a d-powerful number, because it can be written as 8⁵ + 6 + 7 + 4⁴ + 7⁷ + 2¹³ .

It is an unprimeable number.

864772 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2473 + ... + 2800.

It is an arithmetic number, because the mean of its divisors is an integer number (129213).

2⁸⁶⁴⁷⁷² is an apocalyptic number.

864772 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

864772 is a deficient number, since it is larger than the sum of its proper divisors (685784).

864772 is a wasteful number, since it uses less digits than its factorization.

864772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5318 (or 5316 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 864772 is about 929.9311802494. The cubic root of 864772 is about 95.2724221181.

The spelling of 864772 in words is "eight hundred sixty-four thousand, seven hundred seventy-two".