40078640 has 40 divisors (see below), whose sum is σ = 106496160. Its totient is φ = 13741056.

The previous prime is 40078631. The next prime is 40078651. The reversal of 40078640 is 4687004.

It is a tau number, because it is divible by the number of its divisors (40).

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, 35225 + ... + 36344.

It is an arithmetic number, because the mean of its divisors is an integer number (2662404).

Almost surely, 2^40078640 is an apocalyptic number.

40078640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40078640 is an abundant number, since it is smaller than the sum of its proper divisors (66417520).

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

40078640 is a wasteful number, since it uses less digits than its factorization.

40078640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71589 (or 71583 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 40078640 is about 6330.7693055426. The cubic root of 40078640 is about 342.2191634691.

The spelling of 40078640 in words is "forty million, seventy-eight thousand, six hundred forty".