1542640866 has 64 divisors (see below), whose sum is σ = 3489792768. Its totient is φ = 451047168.

The previous prime is 1542640849. The next prime is 1542640901. The reversal of 1542640866 is 6680462451.

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, 278920 + ... + 284396.

It is an arithmetic number, because the mean of its divisors is an integer number (54528012).

Almost surely, 2^1542640866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1542640866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1744896384).

1542640866 is an abundant number, since it is smaller than the sum of its proper divisors (1947151902).

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

1542640866 is a wasteful number, since it uses less digits than its factorization.

1542640866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5675.

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 1542640866 is about 39276.4670763550. The cubic root of 1542640866 is about 1155.4600757025.

The spelling of 1542640866 in words is "one billion, five hundred forty-two million, six hundred forty thousand, eight hundred sixty-six".