28701969 has 16 divisors (see below), whose sum is σ = 38860800. Its totient is φ = 18841680.

The previous prime is 28701949. The next prime is 28701997. The reversal of 28701969 is 96910782.

It is not a de Polignac number, because 28701969 - 2²³ = 20313361 is a prime.

It is a super-2 number, since 2×28701969² = 1647606048953922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28701969.

It is not an unprimeable number, because it can be changed into a prime (28701949) 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, 78024 + ... + 78390.

It is an arithmetic number, because the mean of its divisors is an integer number (2428800).

Almost surely, 2^28701969 is an apocalyptic number.

It is an amenable number.

28701969 is a deficient number, since it is larger than the sum of its proper divisors (10158831).

28701969 is a wasteful number, since it uses less digits than its factorization.

28701969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 28701969 is about 5357.4218613061. The cubic root of 28701969 is about 306.1755901964.

The spelling of 28701969 in words is "twenty-eight million, seven hundred one thousand, nine hundred sixty-nine".