667713640 has 32 divisors (see below), whose sum is σ = 1638934560. Its totient is φ = 242804800.

The previous prime is 667713611. The next prime is 667713643. The reversal of 667713640 is 46317766.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 667713593 and 667713602.

It is not an unprimeable number, because it can be changed into a prime (667713643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758326 + ... + 759205.

It is an arithmetic number, because the mean of its divisors is an integer number (51216705).

Almost surely, 2^667713640 is an apocalyptic number.

It is an amenable number.

667713640 is an abundant number, since it is smaller than the sum of its proper divisors (971220920).

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

667713640 is a wasteful number, since it uses less digits than its factorization.

667713640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517553 (or 1517549 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 667713640 is about 25840.1555722871. The cubic root of 667713640 is about 874.0375332760.

The spelling of 667713640 in words is "six hundred sixty-seven million, seven hundred thirteen thousand, six hundred forty".