1640798136 has 24 divisors (see below), whose sum is σ = 4443828480. Its totient is φ = 546932688.

The previous prime is 1640798119. The next prime is 1640798141. The reversal of 1640798136 is 6318970461.

It is a happy number.

1640798136 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 1640798091 and 1640798100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11394360 + ... + 11394503.

It is an arithmetic number, because the mean of its divisors is an integer number (185159520).

Almost surely, 2^1640798136 is an apocalyptic number.

It is an amenable number.

1640798136 is an abundant number, since it is smaller than the sum of its proper divisors (2803030344).

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

1640798136 is a wasteful number, since it uses less digits than its factorization.

1640798136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22788875 (or 22788868 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1640798136 is about 40506.7665458501. The cubic root of 1640798136 is about 1179.4649820091.

The spelling of 1640798136 in words is "one billion, six hundred forty million, seven hundred ninety-eight thousand, one hundred thirty-six".