867644140 has 48 divisors (see below), whose sum is σ = 2015725824. Its totient is φ = 311057600.

The previous prime is 867644137. The next prime is 867644143. The reversal of 867644140 is 41446768.

It is an interprime number because it is at equal distance from previous prime (867644137) and next prime (867644143).

It is a junction number, because it is equal to n+sod(n) for n = 867644093 and 867644102.

It is not an unprimeable number, because it can be changed into a prime (867644143) 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, 12154 + ... + 43393.

It is an arithmetic number, because the mean of its divisors is an integer number (41994288).

Almost surely, 2^867644140 is an apocalyptic number.

It is an amenable number.

867644140 is an abundant number, since it is smaller than the sum of its proper divisors (1148081684).

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

867644140 is a wasteful number, since it uses less digits than its factorization.

867644140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55638 (or 55636 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 867644140 is about 29455.7997684667. The cubic root of 867644140 is about 953.7778066072. Note that the first 3 decimals are identical.

The spelling of 867644140 in words is "eight hundred sixty-seven million, six hundred forty-four thousand, one hundred forty".