1206136778 has 64 divisors (see below), whose sum is σ = 2337693696. Its totient is φ = 452952000.

The previous prime is 1206136769. The next prime is 1206136783. The reversal of 1206136778 is 8776316021.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2229188 + ... + 2229728.

It is an arithmetic number, because the mean of its divisors is an integer number (36526464).

Almost surely, 2^1206136778 is an apocalyptic number.

1206136778 is a deficient number, since it is larger than the sum of its proper divisors (1131556918).

1206136778 is a wasteful number, since it uses less digits than its factorization.

1206136778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 1206136778 is about 34729.4799557955. The cubic root of 1206136778 is about 1064.4669621278.

The spelling of 1206136778 in words is "one billion, two hundred six million, one hundred thirty-six thousand, seven hundred seventy-eight".