1225687164 has 24 divisors (see below), whose sum is σ = 3079932240. Its totient is φ = 377134464.

The previous prime is 1225687163. The next prime is 1225687171. The reversal of 1225687164 is 4617865221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225687163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3928329 + ... + 3928640.

It is an arithmetic number, because the mean of its divisors is an integer number (128330510).

Almost surely, 2^1225687164 is an apocalyptic number.

It is an amenable number.

1225687164 is an abundant number, since it is smaller than the sum of its proper divisors (1854245076).

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

1225687164 is a wasteful number, since it uses less digits than its factorization.

1225687164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7856989 (or 7856987 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 1225687164 is about 35009.8152522975. The cubic root of 1225687164 is about 1070.1875130655.

The spelling of 1225687164 in words is "one billion, two hundred twenty-five million, six hundred eighty-seven thousand, one hundred sixty-four".