1625205540 has 72 divisors (see below), whose sum is σ = 5293536192. Its totient is φ = 371474880.

The previous prime is 1625205539. The next prime is 1625205541. The reversal of 1625205540 is 455025261.

It is an interprime number because it is at equal distance from previous prime (1625205539) and next prime (1625205541).

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

It is a junction number, because it is equal to n+sod(n) for n = 1625205498 and 1625205507.

It is not an unprimeable number, because it can be changed into a prime (1625205541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 273456 + ... + 279335.

It is an arithmetic number, because the mean of its divisors is an integer number (73521336).

Almost surely, 2^1625205540 is an apocalyptic number.

1625205540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1625205540 is an abundant number, since it is smaller than the sum of its proper divisors (3668330652).

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

1625205540 is a wasteful number, since it uses less digits than its factorization.

1625205540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552817 (or 552808 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1625205540 is about 40313.8380708163. The cubic root of 1625205540 is about 1175.7169103175.

The spelling of 1625205540 in words is "one billion, six hundred twenty-five million, two hundred five thousand, five hundred forty".