1428177820 has 24 divisors (see below), whose sum is σ = 3175596144. Its totient is φ = 537666816.

The previous prime is 1428177743. The next prime is 1428177833. The reversal of 1428177820 is 287718241.

It is a congruent 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, 2099922 + ... + 2100601.

It is an arithmetic number, because the mean of its divisors is an integer number (132316506).

Almost surely, 2^1428177820 is an apocalyptic number.

1428177820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1428177820 is an abundant number, since it is smaller than the sum of its proper divisors (1747418324).

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

1428177820 is a wasteful number, since it uses less digits than its factorization.

1428177820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4200549 (or 4200547 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 1428177820 is about 37791.2399902411. The cubic root of 1428177820 is about 1126.1444340845.

The spelling of 1428177820 in words is "one billion, four hundred twenty-eight million, one hundred seventy-seven thousand, eight hundred twenty".