1581880668 has 48 divisors (see below), whose sum is σ = 3911120640. Its totient is φ = 495902464.

The previous prime is 1581880621. The next prime is 1581880669. The reversal of 1581880668 is 8660881851.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 1581880668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581880669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 414055 + ... + 417857.

It is an arithmetic number, because the mean of its divisors is an integer number (81481680).

Almost surely, 2^1581880668 is an apocalyptic number.

It is an amenable number.

1581880668 is an abundant number, since it is smaller than the sum of its proper divisors (2329239972).

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

1581880668 is a wasteful number, since it uses less digits than its factorization.

1581880668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5866 (or 5864 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 51.

The square root of 1581880668 is about 39772.8634624162. The cubic root of 1581880668 is about 1165.1752192137.

The spelling of 1581880668 in words is "one billion, five hundred eighty-one million, eight hundred eighty thousand, six hundred sixty-eight".