1640520948 has 48 divisors (see below), whose sum is σ = 4288745664. Its totient is φ = 483690240.

The previous prime is 1640520943. The next prime is 1640520949. The reversal of 1640520948 is 8490250461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640520941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163065 + ... + 172832.

It is an arithmetic number, because the mean of its divisors is an integer number (89348868).

Almost surely, 2^1640520948 is an apocalyptic number.

It is an amenable number.

1640520948 is an abundant number, since it is smaller than the sum of its proper divisors (2648224716).

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

1640520948 is a wasteful number, since it uses less digits than its factorization.

1640520948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335952 (or 335950 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1640520948 is about 40503.3448989093. The cubic root of 1640520948 is about 1179.3985606856.

The spelling of 1640520948 in words is "one billion, six hundred forty million, five hundred twenty thousand, nine hundred forty-eight".