28488780 has 48 divisors (see below), whose sum is σ = 88633440. Its totient is φ = 7596864.

The previous prime is 28488773. The next prime is 28488781. The reversal of 28488780 is 8788482.

28488780 is nontrivially palindromic in base 11.

It is a super-2 number, since 2×28488780² = 1623221171776800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28488781) 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, 25839 + ... + 26918.

It is an arithmetic number, because the mean of its divisors is an integer number (1846530).

Almost surely, 2^28488780 is an apocalyptic number.

28488780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28488780 is an abundant number, since it is smaller than the sum of its proper divisors (60144660).

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

28488780 is a wasteful number, since it uses less digits than its factorization.

28488780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52775 (or 52767 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 45.

The square root of 28488780 is about 5337.4881732890. The cubic root of 28488780 is about 305.4156475862.

It can be divided in two parts, 2848 and 8780, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 28488780 in words is "twenty-eight million, four hundred eighty-eight thousand, seven hundred eighty".