28377680 has 40 divisors (see below), whose sum is σ = 66309000. Its totient is φ = 11294208.

The previous prime is 28377677. The next prime is 28377691. The reversal of 28377680 is 8677382.

It can be written as a sum of positive squares in 4 ways, for example, as 6512704 + 21864976 = 2552^2 + 4676^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17546 + ... + 19094.

It is an arithmetic number, because the mean of its divisors is an integer number (1657725).

Almost surely, 2^28377680 is an apocalyptic number.

28377680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28377680 is an abundant number, since it is smaller than the sum of its proper divisors (37931320).

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

28377680 is a wasteful number, since it uses less digits than its factorization.

28377680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791 (or 1785 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 28377680 is about 5327.0704894904. The cubic root of 28377680 is about 305.0181123348.

The spelling of 28377680 in words is "twenty-eight million, three hundred seventy-seven thousand, six hundred eighty".