1642840780 has 48 divisors (see below), whose sum is σ = 4114252800. Its totient is φ = 538769088.

The previous prime is 1642840769. The next prime is 1642840789. The reversal of 1642840780 is 870482461.

It is not an unprimeable number, because it can be changed into a prime (1642840789) 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, 251880 + ... + 258319.

It is an arithmetic number, because the mean of its divisors is an integer number (85713600).

Almost surely, 2^1642840780 is an apocalyptic number.

1642840780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642840780 is an abundant number, since it is smaller than the sum of its proper divisors (2471412020).

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

1642840780 is a wasteful number, since it uses less digits than its factorization.

1642840780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510238 (or 510236 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 1642840780 is about 40531.9723181589. The cubic root of 1642840780 is about 1179.9542211485.

The spelling of 1642840780 in words is "one billion, six hundred forty-two million, eight hundred forty thousand, seven hundred eighty".