40278720 has 56 divisors (see below), whose sum is σ = 127887984. Its totient is φ = 10740736.

The previous prime is 40278691. The next prime is 40278761. The reversal of 40278720 is 2787204.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20019 + ... + 21938.

It is an arithmetic number, because the mean of its divisors is an integer number (2283714).

Almost surely, 2^40278720 is an apocalyptic number.

40278720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40278720 is an abundant number, since it is smaller than the sum of its proper divisors (87609264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40278720 is a wasteful number, since it uses less digits than its factorization.

40278720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41977 (or 41967 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 40278720 is about 6346.5518196892. The cubic root of 40278720 is about 342.7876922820.

The spelling of 40278720 in words is "forty million, two hundred seventy-eight thousand, seven hundred twenty".