72170051 has 8 divisors (see below), whose sum is σ = 74242560. Its totient is φ = 70120008.

The previous prime is 72170041. The next prime is 72170057. The reversal of 72170051 is 15007127.

It is a happy number.

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 72170051 - 2⁶ = 72169987 is a prime.

It is a super-2 number, since 2×72170051² = 10417032522685202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72169999 and 72170026.

It is not an unprimeable number, because it can be changed into a prime (72170057) 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, 1010 + ... + 12056.

It is an arithmetic number, because the mean of its divisors is an integer number (9280320).

Almost surely, 2^72170051 is an apocalyptic number.

72170051 is a deficient number, since it is larger than the sum of its proper divisors (2072509).

72170051 is a wasteful number, since it uses less digits than its factorization.

72170051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11233.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 72170051 is about 8495.2958159207. The cubic root of 72170051 is about 416.3440259294.

Adding to 72170051 its reverse (15007127), we get a palindrome (87177178).

The spelling of 72170051 in words is "seventy-two million, one hundred seventy thousand, fifty-one".