867243640 has 16 divisors (see below), whose sum is σ = 1951298280. Its totient is φ = 346897440.

The previous prime is 867243617. The next prime is 867243647. The reversal of 867243640 is 46342768.

It is a happy number.

867243640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×867243640² = 1504223062240899200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 21681091 = 867243640 / (8 + 6 + 7 + 2 + 4 + 3 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 867243593 and 867243602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867243647) 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, 10840506 + ... + 10840585.

Almost surely, 2^867243640 is an apocalyptic number.

It is an amenable number.

867243640 is an abundant number, since it is smaller than the sum of its proper divisors (1084054640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

867243640 is a wasteful number, since it uses less digits than its factorization.

867243640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21681102 (or 21681098 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 867243640 is about 29449.0006621617. Note that the first 3 decimals coincide. The cubic root of 867243640 is about 953.6310310712.

The spelling of 867243640 in words is "eight hundred sixty-seven million, two hundred forty-three thousand, six hundred forty".