25221078 has 32 divisors (see below), whose sum is σ = 56891520. Its totient is φ = 8280360.

The previous prime is 25221071. The next prime is 25221103. The reversal of 25221078 is 87012252.

It is a super-2 number, since 2×25221078² = 1272205550964168, which contains 22 as substring.

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 (25221071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133 + ... + 7103.

It is an arithmetic number, because the mean of its divisors is an integer number (1777860).

Almost surely, 2^25221078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25221078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28445760).

25221078 is an abundant number, since it is smaller than the sum of its proper divisors (31670442).

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

25221078 is a wasteful number, since it uses less digits than its factorization.

25221078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7049 (or 7043 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 25221078 is about 5022.0591394367. The cubic root of 25221078 is about 293.2611602166.

It can be divided in two parts, 2522 and 1078, that added together give a square (3600 = 60²).

The spelling of 25221078 in words is "twenty-five million, two hundred twenty-one thousand, seventy-eight".