28776440 has 64 divisors (see below), whose sum is σ = 80732160. Its totient is φ = 8968320.

The previous prime is 28776437. The next prime is 28776443. The reversal of 28776440 is 4467782.

It is an interprime number because it is at equal distance from previous prime (28776437) and next prime (28776443).

It is a junction number, because it is equal to n+sod(n) for n = 28776394 and 28776403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28776443) 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, 1592 + ... + 7751.

It is an arithmetic number, because the mean of its divisors is an integer number (1261440).

Almost surely, 2^28776440 is an apocalyptic number.

28776440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28776440 is an abundant number, since it is smaller than the sum of its proper divisors (51955720).

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

28776440 is a wasteful number, since it uses less digits than its factorization.

28776440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9372 (or 9368 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 28776440 is about 5364.3676234949. The cubic root of 28776440 is about 306.4401656630.

The spelling of 28776440 in words is "twenty-eight million, seven hundred seventy-six thousand, four hundred forty".