72071751 has 4 divisors (see below), whose sum is σ = 96095672. Its totient is φ = 48047832.

The previous prime is 72071729. The next prime is 72071761. The reversal of 72071751 is 15717027.

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

It is not a de Polignac number, because 72071751 - 2⁹ = 72071239 is a prime.

It is a super-3 number, since 3×72071751³ (a number of 25 digits) contains 333 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 (72071711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12011956 + ... + 12011961.

It is an arithmetic number, because the mean of its divisors is an integer number (24023918).

Almost surely, 2^72071751 is an apocalyptic number.

72071751 is a deficient number, since it is larger than the sum of its proper divisors (24023921).

72071751 is a wasteful number, since it uses less digits than its factorization.

72071751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24023920.

The product of its (nonzero) digits is 3430, while the sum is 30.

The square root of 72071751 is about 8489.5082896479. The cubic root of 72071751 is about 416.1549114108.

Adding to 72071751 its reverse (15717027), we get a palindrome (87788778).

The spelling of 72071751 in words is "seventy-two million, seventy-one thousand, seven hundred fifty-one".