77221642 has 8 divisors (see below), whose sum is σ = 116071776. Its totient is φ = 38531052.

The previous prime is 77221637. The next prime is 77221673. The reversal of 77221642 is 24612277.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38668 + ... + 40615.

It is an arithmetic number, because the mean of its divisors is an integer number (14508972).

Almost surely, 2^77221642 is an apocalyptic number.

77221642 is a deficient number, since it is larger than the sum of its proper divisors (38850134).

77221642 is a wasteful number, since it uses less digits than its factorization.

77221642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79772.

The product of its digits is 9408, while the sum is 31.

The square root of 77221642 is about 8787.5845372890. The cubic root of 77221642 is about 425.8398929583.

The spelling of 77221642 in words is "seventy-seven million, two hundred twenty-one thousand, six hundred forty-two".