25420557 has 8 divisors (see below), whose sum is σ = 33964000. Its totient is φ = 16912080.

The previous prime is 25420531. The next prime is 25420579. The reversal of 25420557 is 75502452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25420557 - 2¹⁰ = 25419533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25420657) 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, 6994 + ... + 9987.

It is an arithmetic number, because the mean of its divisors is an integer number (4245500).

Almost surely, 2^25420557 is an apocalyptic number.

It is an amenable number.

25420557 is a deficient number, since it is larger than the sum of its proper divisors (8543443).

25420557 is a wasteful number, since it uses less digits than its factorization.

25420557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17483.

The product of its (nonzero) digits is 14000, while the sum is 30.

The square root of 25420557 is about 5041.8803040136. The cubic root of 25420557 is about 294.0322862410.

The spelling of 25420557 in words is "twenty-five million, four hundred twenty thousand, five hundred fifty-seven".