1066021620 has 48 divisors (see below), whose sum is σ = 2988263040. Its totient is φ = 283948416.

The previous prime is 1066021609. The next prime is 1066021631. The reversal of 1066021620 is 261206601.

It is an interprime number because it is at equal distance from previous prime (1066021609) and next prime (1066021631).

It is a super-2 number, since 2×1066021620² = 2272804188614848800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45474 + ... + 64806.

It is an arithmetic number, because the mean of its divisors is an integer number (62255480).

Almost surely, 2^1066021620 is an apocalyptic number.

1066021620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1066021620 is an abundant number, since it is smaller than the sum of its proper divisors (1922241420).

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

1066021620 is a wasteful number, since it uses less digits than its factorization.

1066021620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20264 (or 20262 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1066021620 is about 32649.9865237338. The cubic root of 1066021620 is about 1021.5399077668.

The spelling of 1066021620 in words is "one billion, sixty-six million, twenty-one thousand, six hundred twenty".