1540220660 has 24 divisors (see below), whose sum is σ = 3528506016. Its totient is φ = 560080160.

The previous prime is 1540220657. The next prime is 1540220677. The reversal of 1540220660 is 660220451.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3500282 + ... + 3500721.

It is an arithmetic number, because the mean of its divisors is an integer number (147021084).

Almost surely, 2^1540220660 is an apocalyptic number.

1540220660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1540220660 is an abundant number, since it is smaller than the sum of its proper divisors (1988285356).

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

1540220660 is a wasteful number, since it uses less digits than its factorization.

1540220660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001023 (or 7001021 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1540220660 is about 39245.6451087251. The cubic root of 1540220660 is about 1154.8555031218.

The spelling of 1540220660 in words is "one billion, five hundred forty million, two hundred twenty thousand, six hundred sixty".