75306816 has 168 divisors, whose sum is σ = 237149640. Its totient is φ = 22708224.

The previous prime is 75306811. The next prime is 75306827. The reversal of 75306816 is 61860357.

It can be written as a sum of positive squares in 4 ways, for example, as 6350400 + 68956416 = 2520^2 + 8304^2 .

It is a super-2 number, since 2×75306816² = 11342233072115712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75306811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 666376 + ... + 666488.

It is an arithmetic number, because the mean of its divisors is an integer number (1411605).

Almost surely, 2^75306816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 75306816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118574820).

75306816 is an abundant number, since it is smaller than the sum of its proper divisors (161842824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

75306816 is a wasteful number, since it uses less digits than its factorization.

75306816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 75306816 is about 8677.9499883325. The cubic root of 75306816 is about 422.2906138931.

The spelling of 75306816 in words is "seventy-five million, three hundred six thousand, eight hundred sixteen".