77421061 has 4 divisors (see below), whose sum is σ = 77446624. Its totient is φ = 77395500.

The previous prime is 77421049. The next prime is 77421073. The reversal of 77421061 is 16012477.

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.

It is an interprime number because it is at equal distance from previous prime (77421049) and next prime (77421073).

It is a cyclic number.

It is not a de Polignac number, because 77421061 - 2¹⁹ = 76896773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77421031) 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, 7515 + ... + 14536.

It is an arithmetic number, because the mean of its divisors is an integer number (19361656).

Almost surely, 2^77421061 is an apocalyptic number.

It is an amenable number.

77421061 is a deficient number, since it is larger than the sum of its proper divisors (25563).

77421061 is a wasteful number, since it uses less digits than its factorization.

77421061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25562.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 77421061 is about 8798.9238546540. The cubic root of 77421061 is about 426.2061442139.

The spelling of 77421061 in words is "seventy-seven million, four hundred twenty-one thousand, sixty-one".