1640021448 has 64 divisors (see below), whose sum is σ = 4534810560. Its totient is φ = 490980096.

The previous prime is 1640021393. The next prime is 1640021479. The reversal of 1640021448 is 8441200461.

It is a super-3 number, since 3×1640021448³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59490 + ... + 82577.

It is an arithmetic number, because the mean of its divisors is an integer number (70856415).

Almost surely, 2^1640021448 is an apocalyptic number.

It is an amenable number.

1640021448 is an abundant number, since it is smaller than the sum of its proper divisors (2894789112).

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

1640021448 is a wasteful number, since it uses less digits than its factorization.

1640021448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142126 (or 142122 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 1640021448 is about 40497.1782720722. The cubic root of 1640021448 is about 1179.2788488380.

The spelling of 1640021448 in words is "one billion, six hundred forty million, twenty-one thousand, four hundred forty-eight".