73726640 has 40 divisors (see below), whose sum is σ = 184602768. Its totient is φ = 27221760.

The previous prime is 73726591. The next prime is 73726663. The reversal of 73726640 is 4662737.

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

It is a self number, because there is not a number n which added to its sum of digits gives 73726640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34406 + ... + 36485.

Almost surely, 2^73726640 is an apocalyptic number.

It is an amenable number.

73726640 is an abundant number, since it is smaller than the sum of its proper divisors (110876128).

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

73726640 is a wasteful number, since it uses less digits than its factorization.

73726640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70917 (or 70911 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 73726640 is about 8586.4218391598. The cubic root of 73726640 is about 419.3160447819.

The spelling of 73726640 in words is "seventy-three million, seven hundred twenty-six thousand, six hundred forty".