1225781670 has 32 divisors (see below), whose sum is σ = 2959504128. Its totient is φ = 324916448.

The previous prime is 1225781611. The next prime is 1225781681. The reversal of 1225781670 is 761875221.

1225781670 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117324 + ... + 127343.

It is an arithmetic number, because the mean of its divisors is an integer number (92484504).

Almost surely, 2^1225781670 is an apocalyptic number.

1225781670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1225781670 is an abundant number, since it is smaller than the sum of its proper divisors (1733722458).

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

1225781670 is a wasteful number, since it uses less digits than its factorization.

1225781670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244844.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 1225781670 is about 35011.1649334894. The cubic root of 1225781670 is about 1070.2150177842.

The spelling of 1225781670 in words is "one billion, two hundred twenty-five million, seven hundred eighty-one thousand, six hundred seventy".