75506649 has 4 divisors (see below), whose sum is σ = 100675536. Its totient is φ = 50337764.

The previous prime is 75506623. The next prime is 75506657. The reversal of 75506649 is 94660557.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94660557 = 3 ⋅31553519.

It is a cyclic number.

It is not a de Polignac number, because 75506649 - 2⁵ = 75506617 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 75506649.

It is not an unprimeable number, because it can be changed into a prime (75506689) 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, 12584439 + ... + 12584444.

It is an arithmetic number, because the mean of its divisors is an integer number (25168884).

Almost surely, 2^75506649 is an apocalyptic number.

It is an amenable number.

75506649 is a deficient number, since it is larger than the sum of its proper divisors (25168887).

75506649 is a wasteful number, since it uses less digits than its factorization.

75506649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25168886.

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 75506649 is about 8689.4561970241. The cubic root of 75506649 is about 422.6638119264.

It can be divided in two parts, 7550664 and 9, that multiplied together give a palindrome (67955976).

The spelling of 75506649 in words is "seventy-five million, five hundred six thousand, six hundred forty-nine".