78302978 has 8 divisors (see below), whose sum is σ = 126489468. Its totient is φ = 36139824.

The previous prime is 78302951. The next prime is 78302981. The reversal of 78302978 is 87920387.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78198649 + 104329 = 8843^2 + 323^2 .

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

It is a super-2 number, since 2×78302978² = 12262712727336968, 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, 1505801 + ... + 1505852.

Almost surely, 2^78302978 is an apocalyptic number.

78302978 is a deficient number, since it is larger than the sum of its proper divisors (48186490).

78302978 is a wasteful number, since it uses less digits than its factorization.

78302978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011668.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 78302978 is about 8848.8969934111. The cubic root of 78302978 is about 427.8183677732.

The spelling of 78302978 in words is "seventy-eight million, three hundred two thousand, nine hundred seventy-eight".