2529698640 has 80 divisors (see below), whose sum is σ = 8962366848. Its totient is φ = 578216448.

The previous prime is 2529698629. The next prime is 2529698641. The reversal of 2529698640 is 468969252.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2529698641) 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, 751207 + ... + 754566.

Almost surely, 2^2529698640 is an apocalyptic number.

2529698640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2529698640 is an abundant number, since it is smaller than the sum of its proper divisors (6432668208).

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

2529698640 is a wasteful number, since it uses less digits than its factorization.

2529698640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505796 (or 1505790 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The square root of 2529698640 is about 50296.1095911006. The cubic root of 2529698640 is about 1362.5619671617.

The spelling of 2529698640 in words is "two billion, five hundred twenty-nine million, six hundred ninety-eight thousand, six hundred forty".