1642886740 has 24 divisors (see below), whose sum is σ = 3763704672. Its totient is φ = 597413280.

The previous prime is 1642886719. The next prime is 1642886747. The reversal of 1642886740 is 476882461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642886747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3733614 + ... + 3734053.

It is an arithmetic number, because the mean of its divisors is an integer number (156821028).

Almost surely, 2^1642886740 is an apocalyptic number.

1642886740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642886740 is an abundant number, since it is smaller than the sum of its proper divisors (2120817932).

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

1642886740 is a wasteful number, since it uses less digits than its factorization.

1642886740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7467687 (or 7467685 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 46.

The square root of 1642886740 is about 40532.5392740203. The cubic root of 1642886740 is about 1179.9652244851.

The spelling of 1642886740 in words is "one billion, six hundred forty-two million, eight hundred eighty-six thousand, seven hundred forty".