40028278 has 4 divisors (see below), whose sum is σ = 60042420. Its totient is φ = 20014138.

The previous prime is 40028213. The next prime is 40028291. The reversal of 40028278 is 87282004.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10007068 + ... + 10007071.

It is an arithmetic number, because the mean of its divisors is an integer number (15010605).

Almost surely, 2^40028278 is an apocalyptic number.

40028278 is a deficient number, since it is larger than the sum of its proper divisors (20014142).

40028278 is a wasteful number, since it uses less digits than its factorization.

40028278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20014141.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 40028278 is about 6326.7904975588. The cubic root of 40028278 is about 342.0757615179.

The spelling of 40028278 in words is "forty million, twenty-eight thousand, two hundred seventy-eight".