78408746 has 8 divisors (see below), whose sum is σ = 126660324. Its totient is φ = 36188640.

The previous prime is 78408731. The next prime is 78408749. The reversal of 78408746 is 64780487.

It can be written as a sum of positive squares in 2 ways, for example, as 76125625 + 2283121 = 8725^2 + 1511^2 .

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

It is a super-2 number, since 2×78408746² = 12295862898585032, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78408697 and 78408706.

It is not an unprimeable number, because it can be changed into a prime (78408749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507835 + ... + 1507886.

Almost surely, 2^78408746 is an apocalyptic number.

78408746 is a deficient number, since it is larger than the sum of its proper divisors (48251578).

78408746 is a wasteful number, since it uses less digits than its factorization.

78408746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015736.

The product of its (nonzero) digits is 301056, while the sum is 44.

The square root of 78408746 is about 8854.8713147058. The cubic root of 78408746 is about 428.0109067882.

The spelling of 78408746 in words is "seventy-eight million, four hundred eight thousand, seven hundred forty-six".