77221641 has 16 divisors (see below), whose sum is σ = 117893504. Its totient is φ = 44043264.

The previous prime is 77221637. The next prime is 77221673. The reversal of 77221641 is 14612277.

It is not a de Polignac number, because 77221641 - 2² = 77221637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77221599 and 77221608.

It is not an unprimeable number, because it can be changed into a prime (77221621) 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, 8931 + ... + 15303.

It is an arithmetic number, because the mean of its divisors is an integer number (7368344).

Almost surely, 2^77221641 is an apocalyptic number.

It is an amenable number.

77221641 is a deficient number, since it is larger than the sum of its proper divisors (40671863).

77221641 is a wasteful number, since it uses less digits than its factorization.

77221641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6960.

The product of its digits is 4704, while the sum is 30.

The square root of 77221641 is about 8787.5844803905. The cubic root of 77221641 is about 425.8398911202.

The spelling of 77221641 in words is "seventy-seven million, two hundred twenty-one thousand, six hundred forty-one".