78028642 has 8 divisors (see below), whose sum is σ = 117460332. Its totient is φ = 38875200.

The previous prime is 78028633. The next prime is 78028663. The reversal of 78028642 is 24682087.

It can be written as a sum of positive squares in 2 ways, for example, as 76230361 + 1798281 = 8731^2 + 1341^2 .

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, 68859 + ... + 69982.

Almost surely, 2^78028642 is an apocalyptic number.

78028642 is a deficient number, since it is larger than the sum of its proper divisors (39431690).

78028642 is a wasteful number, since it uses less digits than its factorization.

78028642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139124.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 78028642 is about 8833.3822514369. The cubic root of 78028642 is about 427.3181598424.

The spelling of 78028642 in words is "seventy-eight million, twenty-eight thousand, six hundred forty-two".