78383978 has 8 divisors (see below), whose sum is σ = 119568960. Its totient is φ = 38527660.

The previous prime is 78383959. The next prime is 78383989. The reversal of 78383978 is 87938387.

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

It is a super-2 number, since 2×78383978² = 12288096014208968, 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, 332018 + ... + 332253.

It is an arithmetic number, because the mean of its divisors is an integer number (14946120).

Almost surely, 2^78383978 is an apocalyptic number.

78383978 is a deficient number, since it is larger than the sum of its proper divisors (41184982).

78383978 is a wasteful number, since it uses less digits than its factorization.

78383978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664332.

The product of its digits is 2032128, while the sum is 53.

The square root of 78383978 is about 8853.4726520163. The cubic root of 78383978 is about 427.9658349006.

The spelling of 78383978 in words is "seventy-eight million, three hundred eighty-three thousand, nine hundred seventy-eight".