28672740 has 36 divisors (see below), whose sum is σ = 86974524. Its totient is φ = 7646016.

The previous prime is 28672681. The next prime is 28672741. The reversal of 28672740 is 4727682.

It can be written as a sum of positive squares in 2 ways, for example, as 13133376 + 15539364 = 3624^2 + 3942^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28672695 and 28672704.

It is not an unprimeable number, because it can be changed into a prime (28672741) 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, 79467 + ... + 79826.

It is an arithmetic number, because the mean of its divisors is an integer number (2415959).

Almost surely, 2^28672740 is an apocalyptic number.

28672740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28672740 is an abundant number, since it is smaller than the sum of its proper divisors (58301784).

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

28672740 is a wasteful number, since it uses less digits than its factorization.

28672740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159308 (or 159303 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 28672740 is about 5354.6932685262. The cubic root of 28672740 is about 306.0716223479.

The spelling of 28672740 in words is "twenty-eight million, six hundred seventy-two thousand, seven hundred forty".