1428731730 has 32 divisors (see below), whose sum is σ = 3809952000. Its totient is φ = 380995056.

The previous prime is 1428731729. The next prime is 1428731737. The reversal of 1428731730 is 371378241.

It is not an unprimeable number, because it can be changed into a prime (1428731737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2645530 + ... + 2646069.

It is an arithmetic number, because the mean of its divisors is an integer number (119061000).

Almost surely, 2^1428731730 is an apocalyptic number.

1428731730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1428731730 is an abundant number, since it is smaller than the sum of its proper divisors (2381220270).

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

1428731730 is a wasteful number, since it uses less digits than its factorization.

1428731730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5291615 (or 5291609 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 1428731730 is about 37798.5678300118. The cubic root of 1428731730 is about 1126.2900046683.

The spelling of 1428731730 in words is "one billion, four hundred twenty-eight million, seven hundred thirty-one thousand, seven hundred thirty".