75728644 has 6 divisors (see below), whose sum is σ = 132525134. Its totient is φ = 37864320.

The previous prime is 75728641. The next prime is 75728647. The reversal of 75728644 is 44682757.

It is an interprime number because it is at equal distance from previous prime (75728641) and next prime (75728647).

It can be written as a sum of positive squares in only one way, i.e., 54199044 + 21529600 = 7362^2 + 4640^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 75728644.

It is not an unprimeable number, because it can be changed into a prime (75728641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9466077 + ... + 9466084.

Almost surely, 2^75728644 is an apocalyptic number.

It is an amenable number.

75728644 is a deficient number, since it is larger than the sum of its proper divisors (56796490).

75728644 is a wasteful number, since it uses less digits than its factorization.

75728644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18932165 (or 18932163 counting only the distinct ones).

The product of its digits is 376320, while the sum is 43.

The square root of 75728644 is about 8702.2206361365. The cubic root of 75728644 is about 423.0776273504.

The spelling of 75728644 in words is "seventy-five million, seven hundred twenty-eight thousand, six hundred forty-four".