66759420 has 96 divisors (see below), whose sum is σ = 230082048. Its totient is φ = 14084352.

The previous prime is 66759397. The next prime is 66759431. The reversal of 66759420 is 2495766.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 654 + ... + 11573.

It is an arithmetic number, because the mean of its divisors is an integer number (2396688).

Almost surely, 2^66759420 is an apocalyptic number.

66759420 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 66759420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115041024).

66759420 is an abundant number, since it is smaller than the sum of its proper divisors (163322628).

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

66759420 is a wasteful number, since it uses less digits than its factorization.

66759420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12259 (or 12257 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 66759420 is about 8170.6437934841. The cubic root of 66759420 is about 405.6680940648.

The spelling of 66759420 in words is "sixty-six million, seven hundred fifty-nine thousand, four hundred twenty".