25061640 has 64 divisors (see below), whose sum is σ = 77621760. Its totient is φ = 6466560.

The previous prime is 25061639. The next prime is 25061657. The reversal of 25061640 is 4616052.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25061640.

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, 352 + ... + 7088.

It is an arithmetic number, because the mean of its divisors is an integer number (1212840).

Almost surely, 2^25061640 is an apocalyptic number.

25061640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25061640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38810880).

25061640 is an abundant number, since it is smaller than the sum of its proper divisors (52560120).

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

25061640 is a wasteful number, since it uses less digits than its factorization.

25061640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6782 (or 6778 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 25061640 is about 5006.1602051872. The cubic root of 25061640 is about 292.6418918555.

Adding to 25061640 its reverse (4616052), we get a palindrome (29677692).

The spelling of 25061640 in words is "twenty-five million, sixty-one thousand, six hundred forty".