1640370436 has 6 divisors (see below), whose sum is σ = 2870648270. Its totient is φ = 820185216.

The previous prime is 1640370421. The next prime is 1640370461. The reversal of 1640370436 is 6340730461.

It can be written as a sum of positive squares in only one way, i.e., 1177862400 + 462508036 = 34320^2 + 21506^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205046301 + ... + 205046308.

Almost surely, 2^1640370436 is an apocalyptic number.

It is an amenable number.

1640370436 is a deficient number, since it is larger than the sum of its proper divisors (1230277834).

1640370436 is a wasteful number, since it uses less digits than its factorization.

1640370436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410092613 (or 410092611 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 1640370436 is about 40501.4868369051. The cubic root of 1640370436 is about 1179.3624910324.

The spelling of 1640370436 in words is "one billion, six hundred forty million, three hundred seventy thousand, four hundred thirty-six".