28501378 has 4 divisors (see below), whose sum is σ = 42752070. Its totient is φ = 14250688.

The previous prime is 28501373. The next prime is 28501379. The reversal of 28501378 is 87310582.

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

It can be written as a sum of positive squares in only one way, i.e., 14311089 + 14190289 = 3783^2 + 3767^2 .

It is not an unprimeable number, because it can be changed into a prime (28501373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7125343 + ... + 7125346.

Almost surely, 2^28501378 is an apocalyptic number.

28501378 is a deficient number, since it is larger than the sum of its proper divisors (14250692).

28501378 is a wasteful number, since it uses less digits than its factorization.

28501378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14250691.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 28501378 is about 5338.6681859805. The cubic root of 28501378 is about 305.4606601528.

The spelling of 28501378 in words is "twenty-eight million, five hundred one thousand, three hundred seventy-eight".