1325220644 has 24 divisors (see below), whose sum is σ = 2545501728. Its totient is φ = 598674240.

The previous prime is 1325220629. The next prime is 1325220661. The reversal of 1325220644 is 4460225231.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85217 + ... + 99560.

It is an arithmetic number, because the mean of its divisors is an integer number (106062572).

Almost surely, 2^1325220644 is an apocalyptic number.

It is an amenable number.

1325220644 is a deficient number, since it is larger than the sum of its proper divisors (1220281084).

1325220644 is a wasteful number, since it uses less digits than its factorization.

1325220644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184955 (or 184953 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 1325220644 is about 36403.5800986661. The cubic root of 1325220644 is about 1098.4055809602.

Adding to 1325220644 its reverse (4460225231), we get a palindrome (5785445875).

The spelling of 1325220644 in words is "one billion, three hundred twenty-five million, two hundred twenty thousand, six hundred forty-four".