1625021264 has 40 divisors (see below), whose sum is σ = 3273600000. Its totient is φ = 780506496.

The previous prime is 1625021263. The next prime is 1625021269. The reversal of 1625021264 is 4621205261.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625021263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83537 + ... + 101135.

It is an arithmetic number, because the mean of its divisors is an integer number (81840000).

Almost surely, 2^1625021264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1625021264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1636800000).

1625021264 is an abundant number, since it is smaller than the sum of its proper divisors (1648578736).

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

1625021264 is a wasteful number, since it uses less digits than its factorization.

1625021264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17835 (or 17829 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1625021264 is about 40311.5524880896. The cubic root of 1625021264 is about 1175.6724719181.

The spelling of 1625021264 in words is "one billion, six hundred twenty-five million, twenty-one thousand, two hundred sixty-four".