25402355220 has 72 divisors (see below), whose sum is σ = 78180494112. Its totient is φ = 6158144960.

The previous prime is 25402355201. The next prime is 25402355227. The reversal of 25402355220 is 2255320452.

It is a super-2 number, since 2×25402355220² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25402355227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1742214 + ... + 1756733.

It is an arithmetic number, because the mean of its divisors is an integer number (1085840196).

Almost surely, 2^25402355220 is an apocalyptic number.

25402355220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25402355220 is an abundant number, since it is smaller than the sum of its proper divisors (52778138892).

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

25402355220 is a wasteful number, since it uses less digits than its factorization.

25402355220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498981 (or 3498968 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 30.

Adding to 25402355220 its reverse (2255320452), we get a palindrome (27657675672).

The spelling of 25402355220 in words is "twenty-five billion, four hundred two million, three hundred fifty-five thousand, two hundred twenty".