40678452721 has 9 divisors (see below), whose sum is σ = 41001466233. Its totient is φ = 40357968900.

The previous prime is 40678452677. The next prime is 40678452769. The reversal of 40678452721 is 12725487604.

The square root of 40678452721 is 201689.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 40678452721 - 2⁷ = 40678452593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40678452121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 28034046 + ... + 28035496.

Almost surely, 2^40678452721 is an apocalyptic number.

40678452721 is the 201689-th square number.

40678452721 is the 100845-th centered octagonal number.

It is an amenable number.

40678452721 is a deficient number, since it is larger than the sum of its proper divisors (323013512).

40678452721 is an frugal number, since it uses more digits than its factorization.

40678452721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3180 (or 1590 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 46.

The spelling of 40678452721 in words is "forty billion, six hundred seventy-eight million, four hundred fifty-two thousand, seven hundred twenty-one".