70728770 has 16 divisors (see below), whose sum is σ = 145499328. Its totient is φ = 24249840.

The previous prime is 70728743. The next prime is 70728799. The reversal of 70728770 is 7782707.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505136 + ... + 505275.

It is an arithmetic number, because the mean of its divisors is an integer number (9093708).

Almost surely, 2^70728770 is an apocalyptic number.

70728770 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

70728770 is an abundant number, since it is smaller than the sum of its proper divisors (74770558).

70728770 is a wasteful number, since it uses less digits than its factorization.

70728770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010425.

The product of its (nonzero) digits is 38416, while the sum is 38.

The square root of 70728770 is about 8410.0398334372. The cubic root of 70728770 is about 413.5538185139.

The spelling of 70728770 in words is "seventy million, seven hundred twenty-eight thousand, seven hundred seventy".