72403640 has 32 divisors (see below), whose sum is σ = 163658880. Its totient is φ = 28828032.

The previous prime is 72403627. The next prime is 72403649. The reversal of 72403640 is 4630427.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72403649) by changing a digit.

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, 4862 + ... + 12978.

It is an arithmetic number, because the mean of its divisors is an integer number (5114340).

Almost surely, 2^72403640 is an apocalyptic number.

It is an amenable number.

72403640 is an abundant number, since it is smaller than the sum of its proper divisors (91255240).

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

72403640 is a wasteful number, since it uses less digits than its factorization.

72403640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8351 (or 8347 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 72403640 is about 8509.0328475098. The cubic root of 72403640 is about 416.7927284342.

The spelling of 72403640 in words is "seventy-two million, four hundred three thousand, six hundred forty".