1211278064 has 20 divisors (see below), whose sum is σ = 2359822920. Its totient is φ = 602291520.

The previous prime is 1211278021. The next prime is 1211278073. The reversal of 1211278064 is 4608721121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211278064.

It is a congruent number.

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, 206234 + ... + 212025.

It is an arithmetic number, because the mean of its divisors is an integer number (117991146).

Almost surely, 2^1211278064 is an apocalyptic number.

It is an amenable number.

1211278064 is a deficient number, since it is larger than the sum of its proper divisors (1148544856).

1211278064 is a wasteful number, since it uses less digits than its factorization.

1211278064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418448 (or 418442 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 1211278064 is about 34803.4202916897. The cubic root of 1211278064 is about 1065.9772859767.

Adding to 1211278064 its reverse (4608721121), we get a palindrome (5819999185).

The spelling of 1211278064 in words is "one billion, two hundred eleven million, two hundred seventy-eight thousand, sixty-four".