40278645 has 24 divisors (see below), whose sum is σ = 76164192. Its totient is φ = 19528800.

The previous prime is 40278619. The next prime is 40278649. The reversal of 40278645 is 54687204.

40278645 is a `hidden beast` number, since 4 + 0 + 2 + 7 + 8 + 645 = 666.

It is not a de Polignac number, because 40278645 - 2¹¹ = 40276597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40278649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40191 + ... + 41180.

It is an arithmetic number, because the mean of its divisors is an integer number (3173508).

Almost surely, 2^40278645 is an apocalyptic number.

40278645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40278645 is a deficient number, since it is larger than the sum of its proper divisors (35885547).

40278645 is a wasteful number, since it uses less digits than its factorization.

40278645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81393 (or 81390 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 40278645 is about 6346.5459109661. The cubic root of 40278645 is about 342.7874795220.

The spelling of 40278645 in words is "forty million, two hundred seventy-eight thousand, six hundred forty-five".