72643796 has 6 divisors (see below), whose sum is σ = 127126650. Its totient is φ = 36321896.

The previous prime is 72643793. The next prime is 72643799. The reversal of 72643796 is 69734627.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72643793) and next prime (72643799).

It can be written as a sum of positive squares in only one way, i.e., 38887696 + 33756100 = 6236^2 + 5810^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72643793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9080471 + ... + 9080478.

It is an arithmetic number, because the mean of its divisors is an integer number (21187775).

Almost surely, 2^72643796 is an apocalyptic number.

It is an amenable number.

72643796 is a deficient number, since it is larger than the sum of its proper divisors (54482854).

72643796 is a wasteful number, since it uses less digits than its factorization.

72643796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18160953 (or 18160951 counting only the distinct ones).

The product of its digits is 381024, while the sum is 44.

The square root of 72643796 is about 8523.1329920400. The cubic root of 72643796 is about 417.2530405084.

The spelling of 72643796 in words is "seventy-two million, six hundred forty-three thousand, seven hundred ninety-six".