1428885731 has 32 divisors (see below), whose sum is σ = 1788853248. Its totient is φ = 1111294080.

The previous prime is 1428885701. The next prime is 1428885739. The reversal of 1428885731 is 1375888241.

It is not a de Polignac number, because 1428885731 - 2¹⁰ = 1428884707 is a prime.

It is a super-2 number, since 2×1428885731² = 4083428864510808722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1428885739) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1471076 + ... + 1472046.

It is an arithmetic number, because the mean of its divisors is an integer number (55901664).

Almost surely, 2^1428885731 is an apocalyptic number.

1428885731 is a deficient number, since it is larger than the sum of its proper divisors (359967517).

1428885731 is a wasteful number, since it uses less digits than its factorization.

1428885731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251.

The product of its digits is 430080, while the sum is 47.

The square root of 1428885731 is about 37800.6049025674. The cubic root of 1428885731 is about 1126.3304702906.

The spelling of 1428885731 in words is "one billion, four hundred twenty-eight million, eight hundred eighty-five thousand, seven hundred thirty-one".