28145907 has 12 divisors (see below), whose sum is σ = 41738520. Its totient is φ = 18745560.

The previous prime is 28145893. The next prime is 28145911. The reversal of 28145907 is 70954182.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 28145907 - 2⁸ = 28145651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28145977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27057 + ... + 28077.

It is an arithmetic number, because the mean of its divisors is an integer number (3478210).

Almost surely, 2^28145907 is an apocalyptic number.

28145907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28145907 is a deficient number, since it is larger than the sum of its proper divisors (13592613).

28145907 is an frugal number, since it uses more digits than its factorization.

28145907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051 (or 1024 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28145907 is about 5305.2716235835. The cubic root of 28145907 is about 304.1854355425.

The spelling of 28145907 in words is "twenty-eight million, one hundred forty-five thousand, nine hundred seven".