28070145 has 64 divisors (see below), whose sum is σ = 53844480. Its totient is φ = 13996800.

The previous prime is 28070131. The next prime is 28070149. The reversal of 28070145 is 54107082.

It is not a de Polignac number, because 28070145 - 2⁴ = 28070129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28070149) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 185820 + ... + 185970.

It is an arithmetic number, because the mean of its divisors is an integer number (841320).

Almost surely, 2^28070145 is an apocalyptic number.

It is an amenable number.

28070145 is a deficient number, since it is larger than the sum of its proper divisors (25774335).

28070145 is an equidigital number, since it uses as much as digits as its factorization.

28070145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 28070145 is about 5298.1265556798. The cubic root of 28070145 is about 303.9122589871.

The spelling of 28070145 in words is "twenty-eight million, seventy thousand, one hundred forty-five".