1256006730 has 64 divisors (see below), whose sum is σ = 3300912000. Its totient is φ = 303333120.

The previous prime is 1256006729. The next prime is 1256006749. The reversal of 1256006730 is 376006521.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 81696 + ... + 95844.

It is an arithmetic number, because the mean of its divisors is an integer number (51576750).

Almost surely, 2^1256006730 is an apocalyptic number.

1256006730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256006730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1650456000).

1256006730 is an abundant number, since it is smaller than the sum of its proper divisors (2044905270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256006730 is a wasteful number, since it uses less digits than its factorization.

1256006730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14439.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 1256006730 is about 35440.1852421795. The cubic root of 1256006730 is about 1078.9400695028.

The spelling of 1256006730 in words is "one billion, two hundred fifty-six million, six thousand, seven hundred thirty".