1631440064 has 28 divisors (see below), whose sum is σ = 3298478544. Its totient is φ = 800327424.

The previous prime is 1631440049. The next prime is 1631440079. The reversal of 1631440064 is 4600441361.

It is an interprime number because it is at equal distance from previous prime (1631440049) and next prime (1631440079).

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, 237092 + ... + 243875.

Almost surely, 2^1631440064 is an apocalyptic number.

It is an amenable number.

1631440064 is an abundant number, since it is smaller than the sum of its proper divisors (1667038480).

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

1631440064 is an equidigital number, since it uses as much as digits as its factorization.

1631440064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481032 (or 481022 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1631440064 is about 40391.0889182255. The cubic root of 1631440064 is about 1177.2183987986.

The spelling of 1631440064 in words is "one billion, six hundred thirty-one million, four hundred forty thousand, sixty-four".