1025626644 has 288 divisors, whose sum is σ = 3297974400. Its totient is φ = 274337280.

The previous prime is 1025626627. The next prime is 1025626699. The reversal of 1025626644 is 4466265201.

1025626644 is a `hidden beast` number, since 1 + 0 + 2 + 5 + 6 + 2 + 6 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1025626599 and 1025626608.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 6292107 + ... + 6292269.

It is an arithmetic number, because the mean of its divisors is an integer number (11451300).

Almost surely, 2^1025626644 is an apocalyptic number.

1025626644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1025626644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1648987200).

1025626644 is an abundant number, since it is smaller than the sum of its proper divisors (2272347756).

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

1025626644 is a wasteful number, since it uses less digits than its factorization.

1025626644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 1025626644 is about 32025.4062269318. The cubic root of 1025626644 is about 1008.4702666814.

The spelling of 1025626644 in words is "one billion, twenty-five million, six hundred twenty-six thousand, six hundred forty-four".