78967646 has 4 divisors (see below), whose sum is σ = 118451472. Its totient is φ = 39483822.

The previous prime is 78967639. The next prime is 78967697. The reversal of 78967646 is 64676987.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64676987 = 4007 ⋅16141.

It is a super-3 number, since 3×78967646³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 19741910 + ... + 19741913.

It is an arithmetic number, because the mean of its divisors is an integer number (29612868).

Almost surely, 2^78967646 is an apocalyptic number.

78967646 is a deficient number, since it is larger than the sum of its proper divisors (39483826).

78967646 is a wasteful number, since it uses less digits than its factorization.

78967646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39483825.

The product of its digits is 3048192, while the sum is 53.

The square root of 78967646 is about 8886.3741762318. The cubic root of 78967646 is about 429.0254583958.

The spelling of 78967646 in words is "seventy-eight million, nine hundred sixty-seven thousand, six hundred forty-six".