78219704 has 8 divisors (see below), whose sum is σ = 146661960. Its totient is φ = 39109848.

The previous prime is 78219689. The next prime is 78219721. The reversal of 78219704 is 40791287.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78219704² = 12236644187695232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4888724 + ... + 4888739.

It is an arithmetic number, because the mean of its divisors is an integer number (18332745).

Almost surely, 2^78219704 is an apocalyptic number.

It is an amenable number.

78219704 is a deficient number, since it is larger than the sum of its proper divisors (68442256).

78219704 is a wasteful number, since it uses less digits than its factorization.

78219704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9777469 (or 9777465 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 78219704 is about 8844.1904095287. The cubic root of 78219704 is about 427.6666545842. Note that the first 4 decimals are identical.

The spelling of 78219704 in words is "seventy-eight million, two hundred nineteen thousand, seven hundred four".