1428920065 has 8 divisors (see below), whose sum is σ = 1716124968. Its totient is φ = 1142188800.

The previous prime is 1428920041. The next prime is 1428920081. The reversal of 1428920065 is 5600298241.

It can be written as a sum of positive squares in 4 ways, for example, as 72029169 + 1356890896 = 8487^2 + 36836^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1428920065 - 2⁵ = 1428920033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111736 + ... + 123865.

It is an arithmetic number, because the mean of its divisors is an integer number (214515621).

Almost surely, 2^1428920065 is an apocalyptic number.

It is an amenable number.

1428920065 is a deficient number, since it is larger than the sum of its proper divisors (287204903).

1428920065 is a wasteful number, since it uses less digits than its factorization.

1428920065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236819.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 1428920065 is about 37801.0590460109. The cubic root of 1428920065 is about 1126.3394915673.

The spelling of 1428920065 in words is "one billion, four hundred twenty-eight million, nine hundred twenty thousand, sixty-five".