28757970 has 64 divisors (see below), whose sum is σ = 78503040. Its totient is φ = 7487424.

The previous prime is 28757969. The next prime is 28757977. The reversal of 28757970 is 7975782.

28757970 is a `hidden beast` number, since 2 + 8 + 7 + 579 + 70 = 666.

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 (28757977) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10372 + ... + 12848.

It is an arithmetic number, because the mean of its divisors is an integer number (1226610).

Almost surely, 2^28757970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28757970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39251520).

28757970 is an abundant number, since it is smaller than the sum of its proper divisors (49745070).

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

28757970 is a wasteful number, since it uses less digits than its factorization.

28757970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536 (or 2530 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 28757970 is about 5362.6458022137. The cubic root of 28757970 is about 306.3745893185.

The spelling of 28757970 in words is "twenty-eight million, seven hundred fifty-seven thousand, nine hundred seventy".