77085421 has 4 divisors (see below), whose sum is σ = 88097632. Its totient is φ = 66073212.

The previous prime is 77085419. The next prime is 77085439. The reversal of 77085421 is 12458077.

It is a happy number.

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: 12458077 = 859 ⋅14503.

It is a cyclic number.

It is not a de Polignac number, because 77085421 - 2¹ = 77085419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77085401) 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, 5506095 + ... + 5506108.

It is an arithmetic number, because the mean of its divisors is an integer number (22024408).

Almost surely, 2^77085421 is an apocalyptic number.

It is an amenable number.

77085421 is a deficient number, since it is larger than the sum of its proper divisors (11012211).

77085421 is a wasteful number, since it uses less digits than its factorization.

77085421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11012210.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 77085421 is about 8779.8303514362. The cubic root of 77085421 is about 425.5893480013.

The spelling of 77085421 in words is "seventy-seven million, eighty-five thousand, four hundred twenty-one".