28291007 has 4 divisors (see below), whose sum is σ = 28754856. Its totient is φ = 27827160.

The previous prime is 28290991. The next prime is 28291013. The reversal of 28291007 is 70019282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28291007 - 2⁴ = 28290991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28291097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231833 + ... + 231954.

It is an arithmetic number, because the mean of its divisors is an integer number (7188714).

Almost surely, 2^28291007 is an apocalyptic number.

28291007 is a deficient number, since it is larger than the sum of its proper divisors (463849).

28291007 is an equidigital number, since it uses as much as digits as its factorization.

28291007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463848.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 28291007 is about 5318.9291215432. The cubic root of 28291007 is about 304.7072601009.

The spelling of 28291007 in words is "twenty-eight million, two hundred ninety-one thousand, seven".