28851648 has 56 divisors (see below), whose sum is σ = 87245952. Its totient is φ = 8242944.

The previous prime is 28851619. The next prime is 28851653. The reversal of 28851648 is 84615882.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

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

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, 9390 + ... + 12077.

Almost surely, 2^28851648 is an apocalyptic number.

28851648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28851648 is an abundant number, since it is smaller than the sum of its proper divisors (58394304).

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

28851648 is a wasteful number, since it uses less digits than its factorization.

28851648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21489 (or 21479 counting only the distinct ones).

The product of its digits is 122880, while the sum is 42.

The square root of 28851648 is about 5371.3730088312. The cubic root of 28851648 is about 306.7068966336.

The spelling of 28851648 in words is "twenty-eight million, eight hundred fifty-one thousand, six hundred forty-eight".