28615740 has 24 divisors (see below), whose sum is σ = 80124240. Its totient is φ = 7630848.

The previous prime is 28615739. The next prime is 28615747. The reversal of 28615740 is 4751682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28615747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238405 + ... + 238524.

It is an arithmetic number, because the mean of its divisors is an integer number (3338510).

Almost surely, 2^28615740 is an apocalyptic number.

28615740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28615740 is an abundant number, since it is smaller than the sum of its proper divisors (51508500).

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

28615740 is a wasteful number, since it uses less digits than its factorization.

28615740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476941 (or 476939 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 28615740 is about 5349.3681869918. The cubic root of 28615740 is about 305.8686693467.

The spelling of 28615740 in words is "twenty-eight million, six hundred fifteen thousand, seven hundred forty".