72247776 has 24 divisors (see below), whose sum is σ = 189650664. Its totient is φ = 24082560.

The previous prime is 72247759. The next prime is 72247817. The reversal of 72247776 is 67774227.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×72247776² = 10439482273892352, which contains 22 as substring.

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, 376195 + ... + 376386.

It is an arithmetic number, because the mean of its divisors is an integer number (7902111).

Almost surely, 2^72247776 is an apocalyptic number.

It is an amenable number.

72247776 is an abundant number, since it is smaller than the sum of its proper divisors (117402888).

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

72247776 is a wasteful number, since it uses less digits than its factorization.

72247776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752594 (or 752586 counting only the distinct ones).

The product of its digits is 230496, while the sum is 42.

The square root of 72247776 is about 8499.8691754638. The cubic root of 72247776 is about 416.4934356862.

The spelling of 72247776 in words is "seventy-two million, two hundred forty-seven thousand, seven hundred seventy-six".