2561070640 has 20 divisors (see below), whose sum is σ = 5954489424. Its totient is φ = 1024428224.

The previous prime is 2561070613. The next prime is 2561070641. The reversal of 2561070640 is 460701652.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×2561070640³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (2561070641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16006612 + ... + 16006771.

Almost surely, 2^2561070640 is an apocalyptic number.

2561070640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2561070640 is an abundant number, since it is smaller than the sum of its proper divisors (3393418784).

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

2561070640 is a wasteful number, since it uses less digits than its factorization.

2561070640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32013396 (or 32013390 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 2561070640 is about 50607.0216471983. The cubic root of 2561070640 is about 1368.1714358295.

The spelling of 2561070640 in words is "two billion, five hundred sixty-one million, seventy thousand, six hundred forty".