1920728784 has 80 divisors (see below), whose sum is σ = 5352407424. Its totient is φ = 590016000.

The previous prime is 1920728767. The next prime is 1920728801. The reversal of 1920728784 is 4878270291.

It is an interprime number because it is at equal distance from previous prime (1920728767) and next prime (1920728801).

It is a super-2 number, since 2×1920728784² = 7378398123372237312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 435229 + ... + 439619.

Almost surely, 2^1920728784 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 1920728784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2676203712).

1920728784 is an abundant number, since it is smaller than the sum of its proper divisors (3431678640).

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

1920728784 is a wasteful number, since it uses less digits than its factorization.

1920728784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5116 (or 5110 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 48.

The square root of 1920728784 is about 43826.1198830104. The cubic root of 1920728784 is about 1243.0502395259.

The spelling of 1920728784 in words is "one billion, nine hundred twenty million, seven hundred twenty-eight thousand, seven hundred eighty-four".