667520440 has 16 divisors (see below), whose sum is σ = 1501921080. Its totient is φ = 267008160.

The previous prime is 667520431. The next prime is 667520449. The reversal of 667520440 is 44025766.

It is an interprime number because it is at equal distance from previous prime (667520431) and next prime (667520449).

It is a junction number, because it is equal to n+sod(n) for n = 667520396 and 667520405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667520449) 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, 8343966 + ... + 8344045.

Almost surely, 2^667520440 is an apocalyptic number.

It is an amenable number.

667520440 is an abundant number, since it is smaller than the sum of its proper divisors (834400640).

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

667520440 is a wasteful number, since it uses less digits than its factorization.

667520440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16688022 (or 16688018 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 667520440 is about 25836.4169342423. The cubic root of 667520440 is about 873.9532255076.

The spelling of 667520440 in words is "six hundred sixty-seven million, five hundred twenty thousand, four hundred forty".