1625574840 has 64 divisors (see below), whose sum is σ = 4924108800. Its totient is φ = 429274752.

The previous prime is 1625574823. The next prime is 1625574871. The reversal of 1625574840 is 484755261.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1625574792 and 1625574801.

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, 53400 + ... + 78119.

It is an arithmetic number, because the mean of its divisors is an integer number (76939200).

Almost surely, 2^1625574840 is an apocalyptic number.

1625574840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1625574840 is an abundant number, since it is smaller than the sum of its proper divisors (3298533960).

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

1625574840 is a wasteful number, since it uses less digits than its factorization.

1625574840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131636 (or 131632 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 42.

The square root of 1625574840 is about 40318.4181237310. The cubic root of 1625574840 is about 1175.8059573869.

The spelling of 1625574840 in words is "one billion, six hundred twenty-five million, five hundred seventy-four thousand, eight hundred forty".