78389842 has 16 divisors (see below), whose sum is σ = 126930240. Its totient is φ = 36197392.

The previous prime is 78389803. The next prime is 78389851. The reversal of 78389842 is 24898387.

It is a super-2 number, since 2×78389842² = 12289934657569928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28048 + ... + 30715.

It is an arithmetic number, because the mean of its divisors is an integer number (7933140).

Almost surely, 2^78389842 is an apocalyptic number.

78389842 is a deficient number, since it is larger than the sum of its proper divisors (48540398).

78389842 is a wasteful number, since it uses less digits than its factorization.

78389842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58817.

The product of its digits is 774144, while the sum is 49.

The square root of 78389842 is about 8853.8038153101. The cubic root of 78389842 is about 427.9765068480.

The spelling of 78389842 in words is "seventy-eight million, three hundred eighty-nine thousand, eight hundred forty-two".