1425968644 has 27 divisors (see below), whose sum is σ = 2538052167. Its totient is φ = 701013768.

The previous prime is 1425968549. The next prime is 1425968647. The reversal of 1425968644 is 4468695241.

The square root of 1425968644 is 37762.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

Its product of digits (1658880) is a multiple of the sum of its prime divisors (320).

It is not an unprimeable number, because it can be changed into a prime (1425968647) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5966277 + ... + 5966515.

Almost surely, 2^1425968644 is an apocalyptic number.

1425968644 is the 37762-nd square number.

It is an amenable number.

1425968644 is a deficient number, since it is larger than the sum of its proper divisors (1112083523).

1425968644 is an frugal number, since it uses more digits than its factorization.

1425968644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640 (or 320 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The cubic root of 1425968644 is about 1125.5634758168.

Multiplying 1425968644 by its sum of digits (49), we get a square (69872463556 = 264334²).

The spelling of 1425968644 in words is "one billion, four hundred twenty-five million, nine hundred sixty-eight thousand, six hundred forty-four".