28484940 has 48 divisors (see below), whose sum is σ = 87010560. Its totient is φ = 6905280.

The previous prime is 28484921. The next prime is 28484941. The reversal of 28484940 is 4948482.

It is a super-2 number, since 2×28484940² = 1622783613607200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28484941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20920 + ... + 22239.

It is an arithmetic number, because the mean of its divisors is an integer number (1812720).

Almost surely, 2^28484940 is an apocalyptic number.

28484940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28484940 is an abundant number, since it is smaller than the sum of its proper divisors (58525620).

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

28484940 is a wasteful number, since it uses less digits than its factorization.

28484940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43182 (or 43180 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 28484940 is about 5337.1284413999. The cubic root of 28484940 is about 305.4019246541.

The spelling of 28484940 in words is "twenty-eight million, four hundred eighty-four thousand, nine hundred forty".