75905649 has 12 divisors (see below), whose sum is σ = 111030400. Its totient is φ = 49962744.

The previous prime is 75905633. The next prime is 75905657. The reversal of 75905649 is 94650957.

It is a happy number.

75905649 is a `hidden beast` number, since 7 + 590 + 56 + 4 + 9 = 666.

It is not a de Polignac number, because 75905649 - 2⁴ = 75905633 is a prime.

It is a super-2 number, since 2×75905649² = 11523335100222402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75905689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52669 + ... + 54090.

Almost surely, 2^75905649 is an apocalyptic number.

75905649 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

75905649 is a deficient number, since it is larger than the sum of its proper divisors (35124751).

75905649 is a wasteful number, since it uses less digits than its factorization.

75905649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106844 (or 106841 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The square root of 75905649 is about 8712.3848055512. The cubic root of 75905649 is about 423.4069989123.

The spelling of 75905649 in words is "seventy-five million, nine hundred five thousand, six hundred forty-nine".