72309856 has 24 divisors (see below), whose sum is σ = 146954304. Its totient is φ = 34988160.

The previous prime is 72309841. The next prime is 72309871. The reversal of 72309856 is 65890327.

It is an interprime number because it is at equal distance from previous prime (72309841) and next prime (72309871).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35455 + ... + 37438.

It is an arithmetic number, because the mean of its divisors is an integer number (6123096).

Almost surely, 2^72309856 is an apocalyptic number.

It is an amenable number.

72309856 is an abundant number, since it is smaller than the sum of its proper divisors (74644448).

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

72309856 is a wasteful number, since it uses less digits than its factorization.

72309856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72934 (or 72926 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 72309856 is about 8503.5202122415. The cubic root of 72309856 is about 416.6126943068.

The spelling of 72309856 in words is "seventy-two million, three hundred nine thousand, eight hundred fifty-six".