72281001 has 16 divisors (see below), whose sum is σ = 104143424. Its totient is φ = 44328384.

The previous prime is 72280969. The next prime is 72281003. The reversal of 72281001 is 10018227.

It is not a de Polignac number, because 72281001 - 2⁵ = 72280969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72281003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8955 + ... + 14991.

It is an arithmetic number, because the mean of its divisors is an integer number (6508964).

Almost surely, 2^72281001 is an apocalyptic number.

It is an amenable number.

72281001 is a deficient number, since it is larger than the sum of its proper divisors (31862423).

72281001 is a wasteful number, since it uses less digits than its factorization.

72281001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6360.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 72281001 is about 8501.8233926611. The cubic root of 72281001 is about 416.5572709785.

Adding to 72281001 its reverse (10018227), we get a palindrome (82299228).

The spelling of 72281001 in words is "seventy-two million, two hundred eighty-one thousand, one".