25400628 has 60 divisors (see below), whose sum is σ = 72448992. Its totient is φ = 7696080.

The previous prime is 25400593. The next prime is 25400629. The reversal of 25400628 is 82600452.

25400628 is a nontrivial binomial coefficient, being equal to C(7128, 2).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1 + ... + 7127.

Almost surely, 2^25400628 is an apocalyptic number.

25400628 is the 7127-th triangular number and also the 3564-th hexagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25400628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36224496).

25400628 is an abundant number, since it is smaller than the sum of its proper divisors (47048364).

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

25400628 is a wasteful number, since it uses less digits than its factorization.

25400628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7154 (or 7143 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 25400628 is about 5039.9035705061. The cubic root of 25400628 is about 293.9554284784.

The spelling of 25400628 in words is "twenty-five million, four hundred thousand, six hundred twenty-eight".