1640115312 has 60 divisors (see below), whose sum is σ = 4657175880. Its totient is φ = 497002880.

The previous prime is 1640115227. The next prime is 1640115313. The reversal of 1640115312 is 2135110461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640115313) 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, 135387 + ... + 147002.

It is an arithmetic number, because the mean of its divisors is an integer number (77619598).

Almost surely, 2^1640115312 is an apocalyptic number.

1640115312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1640115312 is an abundant number, since it is smaller than the sum of its proper divisors (3017060568).

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

1640115312 is a wasteful number, since it uses less digits than its factorization.

1640115312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282422 (or 282405 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1640115312 is about 40498.3371510486. The cubic root of 1640115312 is about 1179.3013464540.

Adding to 1640115312 its reverse (2135110461), we get a palindrome (3775225773).

It can be divided in two parts, 16401 and 15312, that added together give a palindrome (31713).

The spelling of 1640115312 in words is "one billion, six hundred forty million, one hundred fifteen thousand, three hundred twelve".