1261684928 has 84 divisors (see below), whose sum is σ = 2967758352. Its totient is φ = 530449920.

The previous prime is 1261684927. The next prime is 1261684951. The reversal of 1261684928 is 8294861621.

It is not an unprimeable number, because it can be changed into a prime (1261684927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162413 + ... + 170003.

Almost surely, 2^1261684928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261684928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1483879176).

1261684928 is an abundant number, since it is smaller than the sum of its proper divisors (1706073424).

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

1261684928 is an equidigital number, since it uses as much as digits as its factorization.

1261684928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7670 (or 7653 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The square root of 1261684928 is about 35520.2045039158. The cubic root of 1261684928 is about 1080.5635284958.

The spelling of 1261684928 in words is "one billion, two hundred sixty-one million, six hundred eighty-four thousand, nine hundred twenty-eight".