1625408720 has 80 divisors (see below), whose sum is σ = 4076739072. Its totient is φ = 599124480.

The previous prime is 1625408711. The next prime is 1625408753. The reversal of 1625408720 is 278045261.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 896615 + ... + 898425.

Almost surely, 2^1625408720 is an apocalyptic number.

1625408720 is a gapful number since it is divisible by the number (10) 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 1625408720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2038369536).

1625408720 is an abundant number, since it is smaller than the sum of its proper divisors (2451330352).

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

1625408720 is a wasteful number, since it uses less digits than its factorization.

1625408720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700 (or 2694 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 1625408720 is about 40316.3579704318. The cubic root of 1625408720 is about 1175.7659035477.

The spelling of 1625408720 in words is "one billion, six hundred twenty-five million, four hundred eight thousand, seven hundred twenty".