2690644257 has 16 divisors (see below), whose sum is σ = 4555588480. Its totient is φ = 1537510896.

The previous prime is 2690644249. The next prime is 2690644277. The reversal of 2690644257 is 7524460962.

2690644257 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2690644257 - 2³ = 2690644249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2690644217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7117918 + ... + 7118295.

It is an arithmetic number, because the mean of its divisors is an integer number (284724280).

Almost surely, 2^2690644257 is an apocalyptic number.

2690644257 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2690644257 is a deficient number, since it is larger than the sum of its proper divisors (1864944223).

2690644257 is a wasteful number, since it uses less digits than its factorization.

2690644257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14236229 (or 14236223 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 2690644257 is about 51871.4204258954. The cubic root of 2690644257 is about 1390.8664364991.

The spelling of 2690644257 in words is "two billion, six hundred ninety million, six hundred forty-four thousand, two hundred fifty-seven".