28145739 has 8 divisors (see below), whose sum is σ = 37668240. Its totient is φ = 18693536.

The previous prime is 28145723. The next prime is 28145791. The reversal of 28145739 is 93754182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28145739 - 2⁴ = 28145723 is a prime.

It is a super-2 number, since 2×28145739² = 1584365247712242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28145697 and 28145706.

It is not an unprimeable number, because it can be changed into a prime (28145539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16632 + ... + 18245.

It is an arithmetic number, because the mean of its divisors is an integer number (4708530).

Almost surely, 2^28145739 is an apocalyptic number.

28145739 is a deficient number, since it is larger than the sum of its proper divisors (9522501).

28145739 is a wasteful number, since it uses less digits than its factorization.

28145739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35149.

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

The square root of 28145739 is about 5305.2557902518. The cubic root of 28145739 is about 304.1848303242.

The spelling of 28145739 in words is "twenty-eight million, one hundred forty-five thousand, seven hundred thirty-nine".