75861749 has 4 divisors (see below), whose sum is σ = 75882540. Its totient is φ = 75840960.

The previous prime is 75861719. The next prime is 75861757. The reversal of 75861749 is 94716857.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94716857 = 5119 ⋅18503.

It can be written as a sum of positive squares in 2 ways, for example, as 29866225 + 45995524 = 5465^2 + 6782^2 .

It is a cyclic number.

It is not a de Polignac number, because 75861749 - 2¹² = 75857653 is a prime.

It is a super-2 number, since 2×75861749² = 11510009922678002, 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 (75861719) 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, 3314 + ... + 12755.

It is an arithmetic number, because the mean of its divisors is an integer number (18970635).

Almost surely, 2^75861749 is an apocalyptic number.

It is an amenable number.

75861749 is a deficient number, since it is larger than the sum of its proper divisors (20791).

75861749 is a wasteful number, since it uses less digits than its factorization.

75861749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20790.

The product of its digits is 423360, while the sum is 47.

The square root of 75861749 is about 8709.8650391381. The cubic root of 75861749 is about 423.3253574182.

The spelling of 75861749 in words is "seventy-five million, eight hundred sixty-one thousand, seven hundred forty-nine".