72800381 has 4 divisors (see below), whose sum is σ = 76632000. Its totient is φ = 68968764.

The previous prime is 72800281. The next prime is 72800393. The reversal of 72800381 is 18300827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72800381 - 2¹⁰ = 72799357 is a prime.

It is a super-2 number, since 2×72800381² = 10599790947490322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72800281) 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, 1915781 + ... + 1915818.

It is an arithmetic number, because the mean of its divisors is an integer number (19158000).

Almost surely, 2^72800381 is an apocalyptic number.

It is an amenable number.

72800381 is a deficient number, since it is larger than the sum of its proper divisors (3831619).

72800381 is a wasteful number, since it uses less digits than its factorization.

72800381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3831618.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 72800381 is about 8532.3139299958. The cubic root of 72800381 is about 417.5526241530.

The spelling of 72800381 in words is "seventy-two million, eight hundred thousand, three hundred eighty-one".