2150778540 has 24 divisors (see below), whose sum is σ = 6022180080. Its totient is φ = 573540928.

The previous prime is 2150778529. The next prime is 2150778541. The reversal of 2150778540 is 458770512.

It is not an unprimeable number, because it can be changed into a prime (2150778541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17923095 + ... + 17923214.

It is an arithmetic number, because the mean of its divisors is an integer number (250924170).

Almost surely, 2^2150778540 is an apocalyptic number.

2150778540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2150778540 is an abundant number, since it is smaller than the sum of its proper divisors (3871401540).

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

2150778540 is a wasteful number, since it uses less digits than its factorization.

2150778540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35846321 (or 35846319 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 39.

The square root of 2150778540 is about 46376.4869303400. The cubic root of 2150778540 is about 1290.8186498859.

The spelling of 2150778540 in words is "two billion, one hundred fifty million, seven hundred seventy-eight thousand, five hundred forty".