72997280 has 24 divisors (see below), whose sum is σ = 172456452. Its totient is φ = 29198848.

The previous prime is 72997279. The next prime is 72997283. The reversal of 72997280 is 8279927.

It can be written as a sum of positive squares in 2 ways, for example, as 59660176 + 13337104 = 7724^2 + 3652^2 .

It is not an unprimeable number, because it can be changed into a prime (72997283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227957 + ... + 228276.

Almost surely, 2^72997280 is an apocalyptic number.

It is an amenable number.

72997280 is an abundant number, since it is smaller than the sum of its proper divisors (99459172).

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

72997280 is a wasteful number, since it uses less digits than its factorization.

72997280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456248 (or 456240 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 72997280 is about 8543.8445678746. The cubic root of 72997280 is about 417.9287287962.

The spelling of 72997280 in words is "seventy-two million, nine hundred ninety-seven thousand, two hundred eighty".