28377980 has 24 divisors (see below), whose sum is σ = 59729712. Its totient is φ = 11325312.

The previous prime is 28377971. The next prime is 28377983. The reversal of 28377980 is 8977382.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28377983) 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, 9104 + ... + 11816.

It is an arithmetic number, because the mean of its divisors is an integer number (2488738).

Almost surely, 2^28377980 is an apocalyptic number.

28377980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28377980 is an abundant number, since it is smaller than the sum of its proper divisors (31351732).

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

28377980 is a wasteful number, since it uses less digits than its factorization.

28377980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245 (or 3243 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 28377980 is about 5327.0986474816. The cubic root of 28377980 is about 305.0191871831.

The spelling of 28377980 in words is "twenty-eight million, three hundred seventy-seven thousand, nine hundred eighty".