72400261 has 8 divisors (see below), whose sum is σ = 75025280. Its totient is φ = 69818112.

The previous prime is 72400259. The next prime is 72400357. The reversal of 72400261 is 16200427.

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

It is a cyclic number.

It is not a de Polignac number, because 72400261 - 2¹ = 72400259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72400561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7260 + ... + 14053.

It is an arithmetic number, because the mean of its divisors is an integer number (9378160).

Almost surely, 2^72400261 is an apocalyptic number.

It is an amenable number.

72400261 is a deficient number, since it is larger than the sum of its proper divisors (2625019).

72400261 is a wasteful number, since it uses less digits than its factorization.

72400261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21435.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 72400261 is about 8508.8342914879. The cubic root of 72400261 is about 416.7862445772.

Adding to 72400261 its reverse (16200427), we get a palindrome (88600688).

The spelling of 72400261 in words is "seventy-two million, four hundred thousand, two hundred sixty-one".