75774921 has 4 divisors (see below), whose sum is σ = 101033232. Its totient is φ = 50516612.

The previous prime is 75774917. The next prime is 75774961. The reversal of 75774921 is 12947757.

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: 12947757 = 3 ⋅4315919.

It is a cyclic number.

It is not a de Polignac number, because 75774921 - 2² = 75774917 is a prime.

It is a super-4 number, since 4×75774921⁴ (a number of 33 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (75774911) 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, 12629151 + ... + 12629156.

It is an arithmetic number, because the mean of its divisors is an integer number (25258308).

Almost surely, 2^75774921 is an apocalyptic number.

It is an amenable number.

75774921 is a deficient number, since it is larger than the sum of its proper divisors (25258311).

75774921 is a wasteful number, since it uses less digits than its factorization.

75774921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25258310.

The product of its digits is 123480, while the sum is 42.

The square root of 75774921 is about 8704.8791490750. The cubic root of 75774921 is about 423.1637892725.

The spelling of 75774921 in words is "seventy-five million, seven hundred seventy-four thousand, nine hundred twenty-one".