72621841 has 4 divisors (see below), whose sum is σ = 76893732. Its totient is φ = 68349952.

The previous prime is 72621839. The next prime is 72621851. The reversal of 72621841 is 14812627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57380625 + 15241216 = 7575^2 + 3904^2 .

It is a cyclic number.

It is not a de Polignac number, because 72621841 - 2¹ = 72621839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72621821) by changing a digit.

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, 2135920 + ... + 2135953.

It is an arithmetic number, because the mean of its divisors is an integer number (19223433).

Almost surely, 2^72621841 is an apocalyptic number.

It is an amenable number.

72621841 is a deficient number, since it is larger than the sum of its proper divisors (4271891).

72621841 is a wasteful number, since it uses less digits than its factorization.

72621841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271890.

The product of its digits is 5376, while the sum is 31.

The square root of 72621841 is about 8521.8449293566. The cubic root of 72621841 is about 417.2110010683.

The spelling of 72621841 in words is "seventy-two million, six hundred twenty-one thousand, eight hundred forty-one".