72991330 has 8 divisors (see below), whose sum is σ = 131384412. Its totient is φ = 29196528.

The previous prime is 72991307. The next prime is 72991361. The reversal of 72991330 is 3319927.

It can be written as a sum of positive squares in 2 ways, for example, as 70408881 + 2582449 = 8391^2 + 1607^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3649557 + ... + 3649576.

Almost surely, 2^72991330 is an apocalyptic number.

72991330 is a deficient number, since it is larger than the sum of its proper divisors (58393082).

72991330 is a wasteful number, since it uses less digits than its factorization.

72991330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7299140.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 72991330 is about 8543.4963568787. The cubic root of 72991330 is about 417.9173733799.

The spelling of 72991330 in words is "seventy-two million, nine hundred ninety-one thousand, three hundred thirty".