75749421 has 16 divisors (see below), whose sum is σ = 113981760. Its totient is φ = 44325120.

The previous prime is 75749417. The next prime is 75749423. The reversal of 75749421 is 12494757.

It is not a de Polignac number, because 75749421 - 2² = 75749417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75749421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75749423) 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, 38620 + ... + 40533.

It is an arithmetic number, because the mean of its divisors is an integer number (7123860).

Almost surely, 2^75749421 is an apocalyptic number.

It is an amenable number.

75749421 is a deficient number, since it is larger than the sum of its proper divisors (38232339).

75749421 is a wasteful number, since it uses less digits than its factorization.

75749421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79196.

The product of its digits is 70560, while the sum is 39.

The square root of 75749421 is about 8703.4143300201. The cubic root of 75749421 is about 423.1163158378.

The spelling of 75749421 in words is "seventy-five million, seven hundred forty-nine thousand, four hundred twenty-one".