4026778920 has 160 divisors (see below), whose sum is σ = 13865017320. Its totient is φ = 1047582720.

The previous prime is 4026778919. The next prime is 4026778957. The reversal of 4026778920 is 298776204.

It can be written as a sum of positive squares in 4 ways, for example, as 3071598084 + 955180836 = 55422^2 + 30906^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 117684 + ... + 147996.

Almost surely, 2^4026778920 is an apocalyptic number.

4026778920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4026778920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6932508660).

4026778920 is an abundant number, since it is smaller than the sum of its proper divisors (9838238400).

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

4026778920 is a wasteful number, since it uses less digits than its factorization.

4026778920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30377 (or 30364 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 4026778920 is about 63456.9060071479. The cubic root of 4026778920 is about 1590.9355832343.

The spelling of 4026778920 in words is "four billion, twenty-six million, seven hundred seventy-eight thousand, nine hundred twenty".