77642 has 4 divisors (see below), whose sum is σ = 116466. Its totient is φ = 38820.

The previous prime is 77641. The next prime is 77647. The reversal of 77642 is 24677.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 63001 + 14641 = 251^2 + 121^2 .

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (77641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19409 + ... + 19412.

2⁷⁷⁶⁴² is an apocalyptic number.

77642 is a deficient number, since it is larger than the sum of its proper divisors (38824).

77642 is a wasteful number, since it uses less digits than its factorization.

77642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38823.

The product of its digits is 2352, while the sum is 26.

The square root of 77642 is about 278.6431409527. The cubic root of 77642 is about 42.6611185277.

It can be divided in two parts, 776 and 42, that added together give a palindrome (818).

The spelling of 77642 in words is "seventy-seven thousand, six hundred forty-two".