2690645690 has 8 divisors (see below), whose sum is σ = 4843162260. Its totient is φ = 1076258272.

The previous prime is 2690645677. The next prime is 2690645729. The reversal of 2690645690 is 965460962.

It can be written as a sum of positive squares in 2 ways, for example, as 2574243169 + 116402521 = 50737^2 + 10789^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2690645690² = 14479148458231152200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134532275 + ... + 134532294.

Almost surely, 2^2690645690 is an apocalyptic number.

2690645690 is a deficient number, since it is larger than the sum of its proper divisors (2152516570).

2690645690 is a wasteful number, since it uses less digits than its factorization.

2690645690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269064576.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 2690645690 is about 51871.4342388949. The cubic root of 2690645690 is about 1390.8666834178.

The spelling of 2690645690 in words is "two billion, six hundred ninety million, six hundred forty-five thousand, six hundred ninety".