40278628 has 12 divisors (see below), whose sum is σ = 75909820. Its totient is φ = 18590112.

The previous prime is 40278619. The next prime is 40278649. The reversal of 40278628 is 82687204.

It can be written as a sum of positive squares in 2 ways, for example, as 21977344 + 18301284 = 4688^2 + 4278^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387243 + ... + 387346.

Almost surely, 2^40278628 is an apocalyptic number.

It is an amenable number.

40278628 is a deficient number, since it is larger than the sum of its proper divisors (35631192).

40278628 is a wasteful number, since it uses less digits than its factorization.

40278628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774606 (or 774604 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 40278628 is about 6346.5445716547. The cubic root of 40278628 is about 342.7874312964.

The spelling of 40278628 in words is "forty million, two hundred seventy-eight thousand, six hundred twenty-eight".