1950991780 has 24 divisors (see below), whose sum is σ = 4129348608. Its totient is φ = 774250848.

The previous prime is 1950991769. The next prime is 1950991781. The reversal of 1950991780 is 871990591.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1950991781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381514 + ... + 386593.

It is an arithmetic number, because the mean of its divisors is an integer number (172056192).

Almost surely, 2^1950991780 is an apocalyptic number.

1950991780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1950991780 is an abundant number, since it is smaller than the sum of its proper divisors (2178356828).

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

1950991780 is a wasteful number, since it uses less digits than its factorization.

1950991780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768243 (or 768241 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 1950991780 is about 44170.0326013011. The cubic root of 1950991780 is about 1249.5447472828.

The spelling of 1950991780 in words is "one billion, nine hundred fifty million, nine hundred ninety-one thousand, seven hundred eighty".