2691009990 has 48 divisors (see below), whose sum is σ = 7167285216. Its totient is φ = 700099200.

The previous prime is 2691009973. The next prime is 2691010013. The reversal of 2691009990 is 999001962.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 360946 + ... + 368325.

It is an arithmetic number, because the mean of its divisors is an integer number (149318442).

Almost surely, 2^2691009990 is an apocalyptic number.

2691009990 is an abundant number, since it is smaller than the sum of its proper divisors (4476275226).

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

2691009990 is a wasteful number, since it uses less digits than its factorization.

2691009990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729325 (or 729322 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 2691009990 is about 51874.9456867186. The cubic root of 2691009990 is about 1390.9294527212.

The spelling of 2691009990 in words is "two billion, six hundred ninety-one million, nine thousand, nine hundred ninety".