1625784840 has 48 divisors (see below), whose sum is σ = 5283801900. Its totient is φ = 433542528.

The previous prime is 1625784821. The next prime is 1625784841. The reversal of 1625784840 is 484875261.

1625784840 is a `hidden beast` number, since 162 + 5 + 7 + 8 + 484 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1615557636 + 10227204 = 40194^2 + 3198^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1625784841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2257675 + ... + 2258394.

Almost surely, 2^1625784840 is an apocalyptic number.

1625784840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1625784840 is an abundant number, since it is smaller than the sum of its proper divisors (3658017060).

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

1625784840 is a wasteful number, since it uses less digits than its factorization.

1625784840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516086 (or 4516079 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 1625784840 is about 40321.0223084683. The cubic root of 1625784840 is about 1175.8565873985.

The spelling of 1625784840 in words is "one billion, six hundred twenty-five million, seven hundred eighty-four thousand, eight hundred forty".