1640286760 has 48 divisors (see below), whose sum is σ = 4293204660. Its totient is φ = 562383360.

The previous prime is 1640286751. The next prime is 1640286761. The reversal of 1640286760 is 676820461.

It can be written as a sum of positive squares in 2 ways, for example, as 1629091044 + 11195716 = 40362^2 + 3346^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1640286761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 416481 + ... + 420400.

Almost surely, 2^1640286760 is an apocalyptic number.

1640286760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640286760 is an abundant number, since it is smaller than the sum of its proper divisors (2652917900).

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

1640286760 is a wasteful number, since it uses less digits than its factorization.

1640286760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836906 (or 836895 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 1640286760 is about 40500.4538246178. The cubic root of 1640286760 is about 1179.3424374291.

The spelling of 1640286760 in words is "one billion, six hundred forty million, two hundred eighty-six thousand, seven hundred sixty".