1261457604 has 96 divisors (see below), whose sum is σ = 3576545280. Its totient is φ = 381319200.

The previous prime is 1261457597. The next prime is 1261457621. The reversal of 1261457604 is 4067541621.

1261457604 is a `hidden beast` number, since 1 + 2 + 6 + 1 + 45 + 7 + 604 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 596509 + ... + 598619.

It is an arithmetic number, because the mean of its divisors is an integer number (37255680).

Almost surely, 2^1261457604 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 1261457604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1788272640).

1261457604 is an abundant number, since it is smaller than the sum of its proper divisors (2315087676).

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

1261457604 is a wasteful number, since it uses less digits than its factorization.

1261457604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638 (or 2630 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 1261457604 is about 35517.0044344959. The cubic root of 1261457604 is about 1080.4986277766.

The spelling of 1261457604 in words is "one billion, two hundred sixty-one million, four hundred fifty-seven thousand, six hundred four".