1278774285 has 32 divisors (see below), whose sum is σ = 2131920000. Its totient is φ = 653726976.

The previous prime is 1278774253. The next prime is 1278774313. The reversal of 1278774285 is 5824778721.

It is not a de Polignac number, because 1278774285 - 2⁵ = 1278774253 is a prime.

It is a super-2 number, since 2×1278774285² = 3270527343954522450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49891 + ... + 71039.

It is an arithmetic number, because the mean of its divisors is an integer number (66622500).

Almost surely, 2^1278774285 is an apocalyptic number.

1278774285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1278774285 is a deficient number, since it is larger than the sum of its proper divisors (853145715).

1278774285 is a wasteful number, since it uses less digits than its factorization.

1278774285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21325.

The product of its digits is 1756160, while the sum is 51.

The square root of 1278774285 is about 35759.9536492988. The cubic root of 1278774285 is about 1085.4203627886.

The spelling of 1278774285 in words is "one billion, two hundred seventy-eight million, seven hundred seventy-four thousand, two hundred eighty-five".