28769520 has 80 divisors (see below), whose sum is σ = 96056352. Its totient is φ = 7080960.

The previous prime is 28769473. The next prime is 28769539. The reversal of 28769520 is 2596782.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1491 + ... + 7730.

Almost surely, 2^28769520 is an apocalyptic number.

28769520 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 28769520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48028176).

28769520 is an abundant number, since it is smaller than the sum of its proper divisors (67286832).

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

28769520 is a wasteful number, since it uses less digits than its factorization.

28769520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9250 (or 9244 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 28769520 is about 5363.7225879048. The cubic root of 28769520 is about 306.4156000120.

The spelling of 28769520 in words is "twenty-eight million, seven hundred sixty-nine thousand, five hundred twenty".