1270342728 has 24 divisors (see below), whose sum is σ = 3440511750. Its totient is φ = 423447552.

The previous prime is 1270342691. The next prime is 1270342741. The reversal of 1270342728 is 8272430721.

1270342728 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 998686404 + 271656324 = 31602^2 + 16482^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×1270342728² = 3227541293164963968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1270342692 and 1270342701.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8821753 + ... + 8821896.

Almost surely, 2^1270342728 is an apocalyptic number.

1270342728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1270342728 is an abundant number, since it is smaller than the sum of its proper divisors (2170169022).

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

1270342728 is a wasteful number, since it uses less digits than its factorization.

1270342728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17643661 (or 17643654 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 1270342728 is about 35641.8676278334. The cubic root of 1270342728 is about 1083.0295390740.

The spelling of 1270342728 in words is "one billion, two hundred seventy million, three hundred forty-two thousand, seven hundred twenty-eight".