1420860728 has 64 divisors (see below), whose sum is σ = 3091089600. Its totient is φ = 599731200.

The previous prime is 1420860709. The next prime is 1420860743. The reversal of 1420860728 is 8270680241.

It is a junction number, because it is equal to n+sod(n) for n = 1420860691 and 1420860700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1294676 + ... + 1295772.

It is an arithmetic number, because the mean of its divisors is an integer number (48298275).

Almost surely, 2^1420860728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1420860728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1545544800).

1420860728 is an abundant number, since it is smaller than the sum of its proper divisors (1670228872).

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

1420860728 is a wasteful number, since it uses less digits than its factorization.

1420860728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440 (or 1436 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 1420860728 is about 37694.3063074518. The cubic root of 1420860728 is about 1124.2179197791.

The spelling of 1420860728 in words is "one billion, four hundred twenty million, eight hundred sixty thousand, seven hundred twenty-eight".