72107551 has 8 divisors (see below), whose sum is σ = 73566224. Its totient is φ = 70657920.

The previous prime is 72107513. The next prime is 72107573. The reversal of 72107551 is 15570127.

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 72107551 - 2⁷ = 72107423 is a prime.

It is a super-2 number, since 2×72107551² = 10398997822435202, 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 (72107051) 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, 15175 + ... + 19351.

It is an arithmetic number, because the mean of its divisors is an integer number (9195778).

Almost surely, 2^72107551 is an apocalyptic number.

72107551 is a deficient number, since it is larger than the sum of its proper divisors (1458673).

72107551 is a wasteful number, since it uses less digits than its factorization.

72107551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 72107551 is about 8491.6165127731. The cubic root of 72107551 is about 416.2238051614.

Adding to 72107551 its reverse (15570127), we get a palindrome (87677678).

The spelling of 72107551 in words is "seventy-two million, one hundred seven thousand, five hundred fifty-one".