72288751 has 4 divisors (see below), whose sum is σ = 72321400. Its totient is φ = 72256104.

The previous prime is 72288631. The next prime is 72288763. The reversal of 72288751 is 15788227.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72288751 is a prime.

It is a super-2 number, since 2×72288751² = 10451327042280002, 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 (72258751) 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, 12741 + ... + 17518.

It is an arithmetic number, because the mean of its divisors is an integer number (18080350).

Almost surely, 2^72288751 is an apocalyptic number.

72288751 is a deficient number, since it is larger than the sum of its proper divisors (32649).

72288751 is a wasteful number, since it uses less digits than its factorization.

72288751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32648.

The product of its digits is 62720, while the sum is 40.

The square root of 72288751 is about 8502.2791650239. The cubic root of 72288751 is about 416.5721582630.

The spelling of 72288751 in words is "seventy-two million, two hundred eighty-eight thousand, seven hundred fifty-one".