75649649 has 4 divisors (see below), whose sum is σ = 77259264. Its totient is φ = 74040036.

The previous prime is 75649627. The next prime is 75649657. The reversal of 75649649 is 94694657.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75649649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75649597 and 75649606.

It is not an unprimeable number, because it can be changed into a prime (75649549) 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, 804737 + ... + 804830.

It is an arithmetic number, because the mean of its divisors is an integer number (19314816).

Almost surely, 2^75649649 is an apocalyptic number.

It is an amenable number.

75649649 is a deficient number, since it is larger than the sum of its proper divisors (1609615).

75649649 is a wasteful number, since it uses less digits than its factorization.

75649649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609614.

The product of its digits is 1632960, while the sum is 50.

The square root of 75649649 is about 8697.6806678562. The cubic root of 75649649 is about 422.9304675132.

It can be divided in two parts, 756 and 49649, that added together give a palindrome (50405).

The spelling of 75649649 in words is "seventy-five million, six hundred forty-nine thousand, six hundred forty-nine".