2781551990 has 32 divisors (see below), whose sum is σ = 5729071680. Its totient is φ = 952504704.

The previous prime is 2781551947. The next prime is 2781552013. The reversal of 2781551990 is 991551872.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34064 + ... + 81996.

It is an arithmetic number, because the mean of its divisors is an integer number (179033490).

Almost surely, 2^2781551990 is an apocalyptic number.

2781551990 is an abundant number, since it is smaller than the sum of its proper divisors (2947519690).

2781551990 is a wasteful number, since it uses less digits than its factorization.

2781551990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48776.

The product of its (nonzero) digits is 226800, while the sum is 47.

The square root of 2781551990 is about 52740.4208363945. The cubic root of 2781551990 is about 1406.3574794823.

The spelling of 2781551990 in words is "two billion, seven hundred eighty-one million, five hundred fifty-one thousand, nine hundred ninety".