667964024 has 64 divisors (see below), whose sum is σ = 1563287040. Its totient is φ = 260507520.

The previous prime is 667963979. The next prime is 667964027. The reversal of 667964024 is 420469766.

It is a Cunningham number, because it is equal to 25845²-1.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667964027) 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, 45227 + ... + 58149.

It is an arithmetic number, because the mean of its divisors is an integer number (24426360).

Almost surely, 2^667964024 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667964024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (781643520).

667964024 is an abundant number, since it is smaller than the sum of its proper divisors (895323016).

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

667964024 is a wasteful number, since it uses less digits than its factorization.

667964024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13020 (or 13016 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 667964024 is about 25844.9999806539. Note that the first 4 decimals coincide. The cubic root of 667964024 is about 874.1467705556.

The spelling of 667964024 in words is "six hundred sixty-seven million, nine hundred sixty-four thousand, twenty-four".