666938040 has 32 divisors (see below), whose sum is σ = 2000814480. Its totient is φ = 177850112.

The previous prime is 666938029. The next prime is 666938089. The reversal of 666938040 is 40839666.

It is a junction number, because it is equal to n+sod(n) for n = 666937983 and 666938001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2778789 + ... + 2779028.

Almost surely, 2^666938040 is an apocalyptic number.

666938040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666938040 is an abundant number, since it is smaller than the sum of its proper divisors (1333876440).

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

666938040 is a wasteful number, since it uses less digits than its factorization.

666938040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5557831 (or 5557827 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 666938040 is about 25825.1435620405. The cubic root of 666938040 is about 873.6989818779.

The spelling of 666938040 in words is "six hundred sixty-six million, nine hundred thirty-eight thousand, forty".