25640577 has 8 divisors (see below), whose sum is σ = 37986080. Its totient is φ = 17093700.

The previous prime is 25640543. The next prime is 25640579. The reversal of 25640577 is 77504652.

25640577 is a `hidden beast` number, since 2 + 5 + 640 + 5 + 7 + 7 = 666.

It is not a de Polignac number, because 25640577 - 2¹⁶ = 25575041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25640579) 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, 474799 + ... + 474852.

It is an arithmetic number, because the mean of its divisors is an integer number (4748260).

Almost surely, 2^25640577 is an apocalyptic number.

25640577 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

25640577 is a deficient number, since it is larger than the sum of its proper divisors (12345503).

25640577 is an equidigital number, since it uses as much as digits as its factorization.

25640577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949660 (or 949654 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The square root of 25640577 is about 5063.6525354728. The cubic root of 25640577 is about 294.8781532607.

The spelling of 25640577 in words is "twenty-five million, six hundred forty thousand, five hundred seventy-seven".