2780938428 has 12 divisors (see below), whose sum is σ = 6488856360. Its totient is φ = 926979472.

The previous prime is 2780938423. The next prime is 2780938469. The reversal of 2780938428 is 8248390872.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×2780938428² = 15467237080654222368, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780938423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115872423 + ... + 115872446.

It is an arithmetic number, because the mean of its divisors is an integer number (540738030).

Almost surely, 2^2780938428 is an apocalyptic number.

It is an amenable number.

2780938428 is an abundant number, since it is smaller than the sum of its proper divisors (3707917932).

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

2780938428 is a wasteful number, since it uses less digits than its factorization.

2780938428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231744876 (or 231744874 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The square root of 2780938428 is about 52734.6037057263. The cubic root of 2780938428 is about 1406.2540658766.

The spelling of 2780938428 in words is "two billion, seven hundred eighty million, nine hundred thirty-eight thousand, four hundred twenty-eight".