28701040 has 80 divisors (see below), whose sum is σ = 70281216. Its totient is φ = 10886400.

The previous prime is 28701019. The next prime is 28701041. The reversal of 28701040 is 4010782.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28701041) 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, 175999 + ... + 176161.

Almost surely, 2^28701040 is an apocalyptic number.

28701040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28701040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35140608).

28701040 is an abundant number, since it is smaller than the sum of its proper divisors (41580176).

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

28701040 is a wasteful number, since it uses less digits than its factorization.

28701040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 28701040 is about 5357.3351584533. The cubic root of 28701040 is about 306.1722868203.

The spelling of 28701040 in words is "twenty-eight million, seven hundred one thousand, forty".