1566432420 has 96 divisors (see below), whose sum is σ = 5094840576. Its totient is φ = 352166400.

The previous prime is 1566432379. The next prime is 1566432473. The reversal of 1566432420 is 242346651.

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, 4951 + ... + 56190.

It is an arithmetic number, because the mean of its divisors is an integer number (53071256).

Almost surely, 2^1566432420 is an apocalyptic number.

1566432420 is a gapful number since it is divisible by the number (10) 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 1566432420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2547420288).

1566432420 is an abundant number, since it is smaller than the sum of its proper divisors (3528408156).

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

1566432420 is a wasteful number, since it uses less digits than its factorization.

1566432420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61221 (or 61219 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 1566432420 is about 39578.1811103037. The cubic root of 1566432420 is about 1161.3698689721.

It can be divided in two parts, 15664 and 32420, that added together give a palindrome (48084).

The spelling of 1566432420 in words is "one billion, five hundred sixty-six million, four hundred thirty-two thousand, four hundred twenty".