1252726778 has 8 divisors (see below), whose sum is σ = 1880179668. Its totient is φ = 626000224.

The previous prime is 1252726759. The next prime is 1252726781. The reversal of 1252726778 is 8776272521.

It can be written as a sum of positive squares in 2 ways, for example, as 1251532129 + 1194649 = 35377^2 + 1093^2 .

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

It is a super-2 number, since 2×1252726778² = 3138648760636522568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177251 + ... + 184182.

Almost surely, 2^1252726778 is an apocalyptic number.

1252726778 is a deficient number, since it is larger than the sum of its proper divisors (627452890).

1252726778 is a wasteful number, since it uses less digits than its factorization.

1252726778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363168.

The product of its digits is 658560, while the sum is 47.

The square root of 1252726778 is about 35393.8805162700. The cubic root of 1252726778 is about 1078.0000648261. Note that the first 4 decimals are identical.

The spelling of 1252726778 in words is "one billion, two hundred fifty-two million, seven hundred twenty-six thousand, seven hundred seventy-eight".