28777560 has 64 divisors (see below), whose sum is σ = 98668800. Its totient is φ = 6577536.

The previous prime is 28777559. The next prime is 28777561. The reversal of 28777560 is 6577782.

It is an interprime number because it is at equal distance from previous prime (28777559) and next prime (28777561).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28777561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16290 + ... + 17969.

It is an arithmetic number, because the mean of its divisors is an integer number (1541700).

Almost surely, 2^28777560 is an apocalyptic number.

28777560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28777560 is an abundant number, since it is smaller than the sum of its proper divisors (69891240).

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

28777560 is a wasteful number, since it uses less digits than its factorization.

28777560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34280 (or 34276 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The square root of 28777560 is about 5364.4720150263. The cubic root of 28777560 is about 306.4441412362. Note that the first 3 decimals are identical.

The spelling of 28777560 in words is "twenty-eight million, seven hundred seventy-seven thousand, five hundred sixty".