78315278 has 8 divisors (see below), whose sum is σ = 118684272. Its totient is φ = 38753856.

The previous prime is 78315239. The next prime is 78315287. The reversal of 78315278 is 87251387.

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

It is a super-2 number, since 2×78315278² = 12266565536434568, which contains 22 as substring.

It is a congruent number.

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, 201650 + ... + 202037.

It is an arithmetic number, because the mean of its divisors is an integer number (14835534).

Almost surely, 2^78315278 is an apocalyptic number.

78315278 is a deficient number, since it is larger than the sum of its proper divisors (40368994).

78315278 is a wasteful number, since it uses less digits than its factorization.

78315278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403786.

The product of its digits is 94080, while the sum is 41.

The square root of 78315278 is about 8849.5919679949. The cubic root of 78315278 is about 427.8407674765.

It can be divided in two parts, 783 and 15278, that added together give a palindrome (16061).

The spelling of 78315278 in words is "seventy-eight million, three hundred fifteen thousand, two hundred seventy-eight".