66344380 has 24 divisors (see below), whose sum is σ = 139864032. Its totient is φ = 26434752.

The previous prime is 66344363. The next prime is 66344407. The reversal of 66344380 is 8344366.

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, 1047 + ... + 11566.

It is an arithmetic number, because the mean of its divisors is an integer number (5827668).

Almost surely, 2^66344380 is an apocalyptic number.

It is an amenable number.

66344380 is an abundant number, since it is smaller than the sum of its proper divisors (73519652).

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

66344380 is a wasteful number, since it uses less digits than its factorization.

66344380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12885 (or 12883 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 66344380 is about 8145.2059519695. The cubic root of 66344380 is about 404.8256730815.

The spelling of 66344380 in words is "sixty-six million, three hundred forty-four thousand, three hundred eighty".