1625661210 has 128 divisors (see below), whose sum is σ = 4226411520. Its totient is φ = 398721024.

The previous prime is 1625661203. The next prime is 1625661221. The reversal of 1625661210 is 121665261.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6325402 + ... + 6325658.

It is an arithmetic number, because the mean of its divisors is an integer number (33018840).

Almost surely, 2^1625661210 is an apocalyptic number.

1625661210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1625661210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2113205760).

1625661210 is an abundant number, since it is smaller than the sum of its proper divisors (2600750310).

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

1625661210 is a wasteful number, since it uses less digits than its factorization.

1625661210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1625661210 is about 40319.4892080741. The cubic root of 1625661210 is about 1175.8267813152.

The spelling of 1625661210 in words is "one billion, six hundred twenty-five million, six hundred sixty-one thousand, two hundred ten".