3778728 has 32 divisors (see below), whose sum is σ = 9571200. Its totient is φ = 1243008.

The previous prime is 3778727. The next prime is 3778759. The reversal of 3778728 is 8278773.

It is a self number, because there is not a number n which added to its sum of digits gives 3778728.

It is not an unprimeable number, because it can be changed into a prime (3778727) 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, 900 + ... + 2892.

It is an arithmetic number, because the mean of its divisors is an integer number (299100).

Almost surely, 2^3778728 is an apocalyptic number.

It is an amenable number.

3778728 is an abundant number, since it is smaller than the sum of its proper divisors (5792472).

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

3778728 is a wasteful number, since it uses less digits than its factorization.

3778728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081 (or 2077 counting only the distinct ones).

The product of its digits is 131712, while the sum is 42.

The square root of 3778728 is about 1943.8950588959. The cubic root of 3778728 is about 155.7573479405.

The spelling of 3778728 in words is "three million, seven hundred seventy-eight thousand, seven hundred twenty-eight".