1642986788 has 12 divisors (see below), whose sum is σ = 2893541532. Its totient is φ = 816260640.

The previous prime is 1642986713. The next prime is 1642986823. The reversal of 1642986788 is 8876892461.

It can be written as a sum of positive squares in 2 ways, for example, as 892336384 + 750650404 = 29872^2 + 27398^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1307483 + ... + 1308738.

It is an arithmetic number, because the mean of its divisors is an integer number (241128461).

Almost surely, 2^1642986788 is an apocalyptic number.

It is an amenable number.

1642986788 is a deficient number, since it is larger than the sum of its proper divisors (1250554744).

1642986788 is a wasteful number, since it uses less digits than its factorization.

1642986788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616382 (or 2616380 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 59.

The square root of 1642986788 is about 40533.7734241459. The cubic root of 1642986788 is about 1179.9891763826.

The spelling of 1642986788 in words is "one billion, six hundred forty-two million, nine hundred eighty-six thousand, seven hundred eighty-eight".