77644442 has 8 divisors (see below), whose sum is σ = 116980416. Its totient is φ = 38650972.

The previous prime is 77644421. The next prime is 77644459. The reversal of 77644442 is 24444677.

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

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 77644396 and 77644405.

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, 85058 + ... + 85965.

It is an arithmetic number, because the mean of its divisors is an integer number (14622552).

Almost surely, 2^77644442 is an apocalyptic number.

77644442 is a deficient number, since it is larger than the sum of its proper divisors (39335974).

77644442 is a wasteful number, since it uses less digits than its factorization.

77644442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171252.

The product of its digits is 150528, while the sum is 38.

The square root of 77644442 is about 8811.6083662405. The cubic root of 77644442 is about 426.6156578289.

The spelling of 77644442 in words is "seventy-seven million, six hundred forty-four thousand, four hundred forty-two".