1256066890 has 32 divisors (see below), whose sum is σ = 2445085440. Its totient is φ = 461826624.

The previous prime is 1256066863. The next prime is 1256066923. The reversal of 1256066890 is 986606521.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10857 + ... + 51283.

It is an arithmetic number, because the mean of its divisors is an integer number (76408920).

Almost surely, 2^1256066890 is an apocalyptic number.

1256066890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256066890 is a deficient number, since it is larger than the sum of its proper divisors (1189018550).

1256066890 is a wasteful number, since it uses less digits than its factorization.

1256066890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40686.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 1256066890 is about 35441.0339860450. The cubic root of 1256066890 is about 1078.9572955247.

It can be divided in two parts, 125606 and 6890, that added together give a square (132496 = 364²).

The spelling of 1256066890 in words is "one billion, two hundred fifty-six million, sixty-six thousand, eight hundred ninety".