28775740 has 36 divisors (see below), whose sum is σ = 70297416. Its totient is φ = 9865632.

The previous prime is 28775699. The next prime is 28775741. The reversal of 28775740 is 4757782.

It is a junction number, because it is equal to n+sod(n) for n = 28775693 and 28775702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28775741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13702 + ... + 15661.

It is an arithmetic number, because the mean of its divisors is an integer number (1952706).

Almost surely, 2^28775740 is an apocalyptic number.

28775740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28775740 is an abundant number, since it is smaller than the sum of its proper divisors (41521676).

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

28775740 is a wasteful number, since it uses less digits than its factorization.

28775740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29386 (or 29377 counting only the distinct ones).

The product of its (nonzero) digits is 109760, while the sum is 40.

The square root of 28775740 is about 5364.3023777561. The cubic root of 28775740 is about 306.4376808774.

The spelling of 28775740 in words is "twenty-eight million, seven hundred seventy-five thousand, seven hundred forty".