825620440 has 16 divisors (see below), whose sum is σ = 1857646080. Its totient is φ = 330248160.

The previous prime is 825620417. The next prime is 825620483. The reversal of 825620440 is 44026528.

It is a super-2 number, since 2×825620440² = 1363298221891587200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10320216 + ... + 10320295.

It is an arithmetic number, because the mean of its divisors is an integer number (116102880).

Almost surely, 2^825620440 is an apocalyptic number.

It is an amenable number.

825620440 is an abundant number, since it is smaller than the sum of its proper divisors (1032025640).

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

825620440 is a wasteful number, since it uses less digits than its factorization.

825620440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20640522 (or 20640518 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 825620440 is about 28733.6116769194. The cubic root of 825620440 is about 938.1237813682.

Adding to 825620440 its reverse (44026528), we get a palindrome (869646968).

The spelling of 825620440 in words is "eight hundred twenty-five million, six hundred twenty thousand, four hundred forty".