25520319 has 32 divisors (see below), whose sum is σ = 42681600. Its totient is φ = 14928480.

The previous prime is 25520309. The next prime is 25520321. The reversal of 25520319 is 91302552.

It is not a de Polignac number, because 25520319 - 2⁷ = 25520191 is a prime.

It is a super-2 number, since 2×25520319² = 1302573363723522, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 25520292 and 25520301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25520309) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7132 + ... + 10094.

It is an arithmetic number, because the mean of its divisors is an integer number (1333800).

Almost surely, 2^25520319 is an apocalyptic number.

25520319 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

25520319 is a deficient number, since it is larger than the sum of its proper divisors (17161281).

25520319 is a wasteful number, since it uses less digits than its factorization.

25520319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012 (or 3006 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 25520319 is about 5051.7639493547. The cubic root of 25520319 is about 294.4164236405.

The spelling of 25520319 in words is "twenty-five million, five hundred twenty thousand, three hundred nineteen".