78212738 has 8 divisors (see below), whose sum is σ = 117573888. Its totient is φ = 39021444.

The previous prime is 78212737. The next prime is 78212773. The reversal of 78212738 is 83721287.

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

It is a super-2 number, since 2×78212738² = 12234464770913288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78212737) 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, 41306 + ... + 43157.

It is an arithmetic number, because the mean of its divisors is an integer number (14696736).

Almost surely, 2^78212738 is an apocalyptic number.

78212738 is a deficient number, since it is larger than the sum of its proper divisors (39361150).

78212738 is a wasteful number, since it uses less digits than its factorization.

78212738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84928.

The product of its digits is 37632, while the sum is 38.

The square root of 78212738 is about 8843.7965829162. The cubic root of 78212738 is about 427.6539586597.

The spelling of 78212738 in words is "seventy-eight million, two hundred twelve thousand, seven hundred thirty-eight".