1272040778 has 8 divisors (see below), whose sum is σ = 1932214080. Its totient is φ = 627969420.

The previous prime is 1272040769. The next prime is 1272040807. The reversal of 1272040778 is 8770402721.

It is a happy number.

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

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, 4025288 + ... + 4025603.

It is an arithmetic number, because the mean of its divisors is an integer number (241526760).

Almost surely, 2^1272040778 is an apocalyptic number.

1272040778 is a deficient number, since it is larger than the sum of its proper divisors (660173302).

1272040778 is an equidigital number, since it uses as much as digits as its factorization.

1272040778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8050972.

The product of its (nonzero) digits is 43904, while the sum is 38.

The square root of 1272040778 is about 35665.6806748448. The cubic root of 1272040778 is about 1083.5118812196.

The spelling of 1272040778 in words is "one billion, two hundred seventy-two million, forty thousand, seven hundred seventy-eight".