78057842 has 4 divisors (see below), whose sum is σ = 117086766. Its totient is φ = 39028920.

The previous prime is 78057841. The next prime is 78057851. The reversal of 78057842 is 24875087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24875087 = 1949 ⋅12763.

It can be written as a sum of positive squares in only one way, i.e., 77281681 + 776161 = 8791^2 + 881^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78057842.

It is not an unprimeable number, because it can be changed into a prime (78057841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19514459 + ... + 19514462.

Almost surely, 2^78057842 is an apocalyptic number.

78057842 is a deficient number, since it is larger than the sum of its proper divisors (39028924).

78057842 is a wasteful number, since it uses less digits than its factorization.

78057842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39028923.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 78057842 is about 8835.0349178710. The cubic root of 78057842 is about 427.3714570838.

The spelling of 78057842 in words is "seventy-eight million, fifty-seven thousand, eight hundred forty-two".