78235778 has 8 divisors (see below), whose sum is σ = 117399360. Its totient is φ = 39102660.

The previous prime is 78235727. The next prime is 78235799. The reversal of 78235778 is 87753287.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78235778² = 12241673918530568, which contains 22 as substring.

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, 563 + ... + 12521.

It is an arithmetic number, because the mean of its divisors is an integer number (14674920).

Almost surely, 2^78235778 is an apocalyptic number.

78235778 is a deficient number, since it is larger than the sum of its proper divisors (39163582).

78235778 is a wasteful number, since it uses less digits than its factorization.

78235778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15232.

The product of its digits is 658560, while the sum is 47.

The square root of 78235778 is about 8845.0990949791. The cubic root of 78235778 is about 427.6959474717.

The spelling of 78235778 in words is "seventy-eight million, two hundred thirty-five thousand, seven hundred seventy-eight".