1961575840 has 192 divisors, whose sum is σ = 5583513600. Its totient is φ = 650280960.

The previous prime is 1961575823. The next prime is 1961575853. The reversal of 1961575840 is 485751691.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1700704 + ... + 1701856.

It is an arithmetic number, because the mean of its divisors is an integer number (29080800).

Almost surely, 2^1961575840 is an apocalyptic number.

1961575840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1961575840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2791756800).

1961575840 is an abundant number, since it is smaller than the sum of its proper divisors (3621937760).

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

1961575840 is a wasteful number, since it uses less digits than its factorization.

1961575840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220 (or 1198 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 46.

The square root of 1961575840 is about 44289.6809652090. The cubic root of 1961575840 is about 1251.8002518965.

The spelling of 1961575840 in words is "one billion, nine hundred sixty-one million, five hundred seventy-five thousand, eight hundred forty".