66701940 has 48 divisors (see below), whose sum is σ = 188879040. Its totient is φ = 17585920.

The previous prime is 66701933. The next prime is 66701959. The reversal of 66701940 is 4910766.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 906 + ... + 11585.

It is an arithmetic number, because the mean of its divisors is an integer number (3934980).

Almost surely, 2^66701940 is an apocalyptic number.

66701940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66701940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94439520).

66701940 is an abundant number, since it is smaller than the sum of its proper divisors (122177100).

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

66701940 is a wasteful number, since it uses less digits than its factorization.

66701940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12592 (or 12590 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 66701940 is about 8167.1255653382. The cubic root of 66701940 is about 405.5516336089.

The spelling of 66701940 in words is "sixty-six million, seven hundred one thousand, nine hundred forty".