2784657820 has 24 divisors (see below), whose sum is σ = 6683179104. Its totient is φ = 954739776.

The previous prime is 2784657791. The next prime is 2784657829. The reversal of 2784657820 is 287564872.

2784657820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2784657829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9945067 + ... + 9945346.

It is an arithmetic number, because the mean of its divisors is an integer number (278465796).

Almost surely, 2^2784657820 is an apocalyptic number.

2784657820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2784657820 is an abundant number, since it is smaller than the sum of its proper divisors (3898521284).

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

2784657820 is a wasteful number, since it uses less digits than its factorization.

2784657820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19890429 (or 19890427 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 49.

The square root of 2784657820 is about 52769.8571155920. The cubic root of 2784657820 is about 1406.8807224494.

The spelling of 2784657820 in words is "two billion, seven hundred eighty-four million, six hundred fifty-seven thousand, eight hundred twenty".