75221045 has 16 divisors (see below), whose sum is σ = 92336112. Its totient is φ = 58805760.

The previous prime is 75221033. The next prime is 75221053. The reversal of 75221045 is 54012257.

It can be written as a sum of positive squares in 8 ways, for example, as 6646084 + 68574961 = 2578^2 + 8281^2 .

It is not a de Polignac number, because 75221045 - 2¹⁰ = 75220021 is a prime.

It is a super-2 number, since 2×75221045² = 11316411221784050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98465 + ... + 99225.

It is an arithmetic number, because the mean of its divisors is an integer number (5771007).

Almost surely, 2^75221045 is an apocalyptic number.

It is an amenable number.

75221045 is a deficient number, since it is larger than the sum of its proper divisors (17115067).

75221045 is a wasteful number, since it uses less digits than its factorization.

75221045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 75221045 is about 8673.0066874182. The cubic root of 75221045 is about 422.1302297917.

The spelling of 75221045 in words is "seventy-five million, two hundred twenty-one thousand, forty-five".