75777421 has 4 divisors (see below), whose sum is σ = 75898144. Its totient is φ = 75656700.

The previous prime is 75777413. The next prime is 75777437. The reversal of 75777421 is 12477757.

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: 12477757 = 383 ⋅32579.

It is a cyclic number.

It is not a de Polignac number, because 75777421 - 2³ = 75777413 is a prime.

It is a super-2 number, since 2×75777421² = 11484435066822482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75777521) 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, 59415 + ... + 60676.

It is an arithmetic number, because the mean of its divisors is an integer number (18974536).

Almost surely, 2^75777421 is an apocalyptic number.

It is an amenable number.

75777421 is a deficient number, since it is larger than the sum of its proper divisors (120723).

75777421 is a wasteful number, since it uses less digits than its factorization.

75777421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120722.

The product of its digits is 96040, while the sum is 40.

The square root of 75777421 is about 8705.0227455188. The cubic root of 75777421 is about 423.1684429575.

The spelling of 75777421 in words is "seventy-five million, seven hundred seventy-seven thousand, four hundred twenty-one".