70728278 has 4 divisors (see below), whose sum is σ = 106092420. Its totient is φ = 35364138.

The previous prime is 70728277. The next prime is 70728293. The reversal of 70728278 is 87282707.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70728271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17682068 + ... + 17682071.

It is an arithmetic number, because the mean of its divisors is an integer number (26523105).

Almost surely, 2^70728278 is an apocalyptic number.

70728278 is a deficient number, since it is larger than the sum of its proper divisors (35364142).

70728278 is a wasteful number, since it uses less digits than its factorization.

70728278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35364141.

The product of its (nonzero) digits is 87808, while the sum is 41.

The square root of 70728278 is about 8410.0105826331. The cubic root of 70728278 is about 413.5528595975.

The spelling of 70728278 in words is "seventy million, seven hundred twenty-eight thousand, two hundred seventy-eight".