1268609578 has 8 divisors (see below), whose sum is σ = 1903379940. Its totient is φ = 634149600.

The previous prime is 1268609567. The next prime is 1268609579. The reversal of 1268609578 is 8759068621.

It can be written as a sum of positive squares in 2 ways, for example, as 1158925849 + 109683729 = 34043^2 + 10473^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1268609578² = 3218740522786676168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1268609579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67093 + ... + 83896.

Almost surely, 2^1268609578 is an apocalyptic number.

1268609578 is a deficient number, since it is larger than the sum of its proper divisors (634770362).

1268609578 is a wasteful number, since it uses less digits than its factorization.

1268609578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155192.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The square root of 1268609578 is about 35617.5459289379. The cubic root of 1268609578 is about 1082.5367830948.

The spelling of 1268609578 in words is "one billion, two hundred sixty-eight million, six hundred nine thousand, five hundred seventy-eight".