1428756730 has 24 divisors (see below), whose sum is σ = 2608856532. Its totient is φ = 563270976.

The previous prime is 1428756727. The next prime is 1428756733. The reversal of 1428756730 is 376578241.

It is an interprime number because it is at equal distance from previous prime (1428756727) and next prime (1428756733).

It can be written as a sum of positive squares in 2 ways, for example, as 1426799529 + 1957201 = 37773^2 + 1399^2 .

It is not an unprimeable number, because it can be changed into a prime (1428756733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1020571 + ... + 1021969.

Almost surely, 2^1428756730 is an apocalyptic number.

1428756730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1428756730 is a deficient number, since it is larger than the sum of its proper divisors (1180099802).

1428756730 is an frugal number, since it uses more digits than its factorization.

1428756730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2878 (or 1479 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 1428756730 is about 37798.8985289254. The cubic root of 1428756730 is about 1126.2965739179.

It can be divided in two parts, 14287 and 56730, that added together give a palindrome (71017).

The spelling of 1428756730 in words is "one billion, four hundred twenty-eight million, seven hundred fifty-six thousand, seven hundred thirty".