667307940 has 144 divisors (see below), whose sum is σ = 2060455488. Its totient is φ = 160376832.

The previous prime is 667307939. The next prime is 667307959. The reversal of 667307940 is 49703766.

It is a junction number, because it is equal to n+sod(n) for n = 667307892 and 667307901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5905324 + ... + 5905436.

Almost surely, 2^667307940 is an apocalyptic number.

667307940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667307940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1030227744).

667307940 is an abundant number, since it is smaller than the sum of its proper divisors (1393147548).

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

667307940 is a wasteful number, since it uses less digits than its factorization.

667307940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 42.

The square root of 667307940 is about 25832.3041945545. The cubic root of 667307940 is about 873.8604769016.

The spelling of 667307940 in words is "six hundred sixty-seven million, three hundred seven thousand, nine hundred forty".