28526640 has 40 divisors (see below), whose sum is σ = 88433328. Its totient is φ = 7607040.

The previous prime is 28526627. The next prime is 28526653. The reversal of 28526640 is 4662582.

It is an interprime number because it is at equal distance from previous prime (28526627) and next prime (28526653).

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59191 + ... + 59670.

Almost surely, 2^28526640 is an apocalyptic number.

28526640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28526640 is an abundant number, since it is smaller than the sum of its proper divisors (59906688).

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

28526640 is a wasteful number, since it uses less digits than its factorization.

28526640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118877 (or 118871 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 28526640 is about 5341.0336078329. The cubic root of 28526640 is about 305.5508811529.

The spelling of 28526640 in words is "twenty-eight million, five hundred twenty-six thousand, six hundred forty".