75457561 has 16 divisors (see below), whose sum is σ = 79340800. Its totient is φ = 71705088.

The previous prime is 75457537. The next prime is 75457567. The reversal of 75457561 is 16575457.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 75457561 - 2¹⁵ = 75424793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75457567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 329395 + ... + 329623.

It is an arithmetic number, because the mean of its divisors is an integer number (4958800).

Almost surely, 2^75457561 is an apocalyptic number.

It is an amenable number.

75457561 is a deficient number, since it is larger than the sum of its proper divisors (3883239).

75457561 is a wasteful number, since it uses less digits than its factorization.

75457561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448.

The product of its digits is 147000, while the sum is 40.

The square root of 75457561 is about 8686.6311651871. The cubic root of 75457561 is about 422.5721987187.

The spelling of 75457561 in words is "seventy-five million, four hundred fifty-seven thousand, five hundred sixty-one".