1428788773 has 4 divisors (see below), whose sum is σ = 1490910048. Its totient is φ = 1366667500.

The previous prime is 1428788761. The next prime is 1428788789. The reversal of 1428788773 is 3778878241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3778878241 = 1297 ⋅2913553.

It is a cyclic number.

It is not a de Polignac number, because 1428788773 - 2⁵ = 1428788741 is a prime.

It is a super-3 number, since 3×1428788773³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428788173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31060603 + ... + 31060648.

It is an arithmetic number, because the mean of its divisors is an integer number (372727512).

Almost surely, 2^1428788773 is an apocalyptic number.

It is an amenable number.

1428788773 is a deficient number, since it is larger than the sum of its proper divisors (62121275).

1428788773 is an equidigital number, since it uses as much as digits as its factorization.

1428788773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62121274.

The product of its digits is 4214784, while the sum is 55.

The square root of 1428788773 is about 37799.3223881064. The cubic root of 1428788773 is about 1126.3049937444.

The spelling of 1428788773 in words is "one billion, four hundred twenty-eight million, seven hundred eighty-eight thousand, seven hundred seventy-three".