77954642 has 8 divisors (see below), whose sum is σ = 116977932. Its totient is φ = 38962000.

The previous prime is 77954629. The next prime is 77954647. The reversal of 77954642 is 24645977.

It can be written as a sum of positive squares in 2 ways, for example, as 58232161 + 19722481 = 7631^2 + 4441^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 77954593 and 77954602.

It is not an unprimeable number, because it can be changed into a prime (77954647) 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, 392 + ... + 12492.

Almost surely, 2^77954642 is an apocalyptic number.

77954642 is a deficient number, since it is larger than the sum of its proper divisors (39023290).

77954642 is a wasteful number, since it uses less digits than its factorization.

77954642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15324.

The product of its digits is 423360, while the sum is 44.

The square root of 77954642 is about 8829.1926018181. The cubic root of 77954642 is about 427.1830319176.

The spelling of 77954642 in words is "seventy-seven million, nine hundred fifty-four thousand, six hundred forty-two".