78241642 has 4 divisors (see below), whose sum is σ = 117362466. Its totient is φ = 39120820.

The previous prime is 78241577. The next prime is 78241651. The reversal of 78241642 is 24614287.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24614287 = 37 ⋅665251.

It can be written as a sum of positive squares in only one way, i.e., 56535361 + 21706281 = 7519^2 + 4659^2 .

It is a super-2 number, since 2×78241642² = 12243509085712328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78241598 and 78241607.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19560409 + ... + 19560412.

Almost surely, 2^78241642 is an apocalyptic number.

78241642 is a deficient number, since it is larger than the sum of its proper divisors (39120824).

78241642 is a wasteful number, since it uses less digits than its factorization.

78241642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39120823.

The product of its digits is 21504, while the sum is 34.

The square root of 78241642 is about 8845.4305717698. The cubic root of 78241642 is about 427.7066328914.

It can be divided in two parts, 782 and 41642, that added together give a palindrome (42424).

The spelling of 78241642 in words is "seventy-eight million, two hundred forty-one thousand, six hundred forty-two".