1025664540 has 48 divisors (see below), whose sum is σ = 2882503680. Its totient is φ = 272496960.

The previous prime is 1025664529. The next prime is 1025664613. The reversal of 1025664540 is 454665201.

It is a super-2 number, since 2×1025664540² = 2103975497226823200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15280 + ... + 47799.

It is an arithmetic number, because the mean of its divisors is an integer number (60052160).

Almost surely, 2^1025664540 is an apocalyptic number.

1025664540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1025664540 is an abundant number, since it is smaller than the sum of its proper divisors (1856839140).

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

1025664540 is a wasteful number, since it uses less digits than its factorization.

1025664540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63362 (or 63360 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 1025664540 is about 32025.9978767251. The cubic root of 1025664540 is about 1008.4826872241.

The spelling of 1025664540 in words is "one billion, twenty-five million, six hundred sixty-four thousand, five hundred forty".