66023580 has 144 divisors (see below), whose sum is σ = 227870496. Its totient is φ = 14192640.

The previous prime is 66023569. The next prime is 66023603. The reversal of 66023580 is 8532066.

It is a super-2 number, since 2×66023580² = 8718226232032800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49320 + ... + 50640.

It is an arithmetic number, because the mean of its divisors is an integer number (1582434).

Almost surely, 2^66023580 is an apocalyptic number.

66023580 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 66023580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113935248).

66023580 is an abundant number, since it is smaller than the sum of its proper divisors (161846916).

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

66023580 is a wasteful number, since it uses less digits than its factorization.

66023580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364 (or 1355 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 66023580 is about 8125.4895237149. The cubic root of 66023580 is about 404.1721238266.

The spelling of 66023580 in words is "sixty-six million, twenty-three thousand, five hundred eighty".