25645420 has 24 divisors (see below), whose sum is σ = 53986464. Its totient is φ = 10233216.

The previous prime is 25645397. The next prime is 25645427. The reversal of 25645420 is 2454652.

25645420 = T₄₉ + T₅₀ + ... + T₅₃₅.

It is not an unprimeable number, because it can be changed into a prime (25645427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8424 + ... + 11056.

It is an arithmetic number, because the mean of its divisors is an integer number (2249436).

Almost surely, 2^25645420 is an apocalyptic number.

25645420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25645420 is an abundant number, since it is smaller than the sum of its proper divisors (28341044).

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

25645420 is a wasteful number, since it uses less digits than its factorization.

25645420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3129 (or 3127 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 25645420 is about 5064.1307250110. The cubic root of 25645420 is about 294.8967176504.

The spelling of 25645420 in words is "twenty-five million, six hundred forty-five thousand, four hundred twenty".