2820919990 has 64 divisors (see below), whose sum is σ = 6245278848. Its totient is φ = 895334400.

The previous prime is 2820919967. The next prime is 2820919991. The reversal of 2820919990 is 999190282.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2820919991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53160 + ... + 92020.

It is an arithmetic number, because the mean of its divisors is an integer number (97582482).

Almost surely, 2^2820919990 is an apocalyptic number.

2820919990 is an abundant number, since it is smaller than the sum of its proper divisors (3424358858).

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

2820919990 is a wasteful number, since it uses less digits than its factorization.

2820919990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38953.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 2820919990 is about 53112.3336900197. Note that the first 3 decimals coincide. The cubic root of 2820919990 is about 1412.9612646561.

The spelling of 2820919990 in words is "two billion, eight hundred twenty million, nine hundred nineteen thousand, nine hundred ninety".