1625244740 has 36 divisors (see below), whose sum is σ = 3970243116. Its totient is φ = 557226432.

The previous prime is 1625244737. The next prime is 1625244757. The reversal of 1625244740 is 474425261.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 474542656 + 1150702084 = 21784^2 + 33922^2 .

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1625244740.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 828227 + ... + 830186.

It is an arithmetic number, because the mean of its divisors is an integer number (110284531).

Almost surely, 2^1625244740 is an apocalyptic number.

1625244740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1625244740 is an abundant number, since it is smaller than the sum of its proper divisors (2344998376).

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

1625244740 is a wasteful number, since it uses less digits than its factorization.

1625244740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658436 (or 1658427 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 35.

The square root of 1625244740 is about 40314.3242532974. The cubic root of 1625244740 is about 1175.7263630156.

The spelling of 1625244740 in words is "one billion, six hundred twenty-five million, two hundred forty-four thousand, seven hundred forty".