70515978 has 32 divisors (see below), whose sum is σ = 153401472. Its totient is φ = 21480000.

The previous prime is 70515967. The next prime is 70515997. The reversal of 70515978 is 87951507.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3403 + ... + 12353.

It is an arithmetic number, because the mean of its divisors is an integer number (4793796).

Almost surely, 2^70515978 is an apocalyptic number.

70515978 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 70515978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76700736).

70515978 is an abundant number, since it is smaller than the sum of its proper divisors (82885494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70515978 is a wasteful number, since it uses less digits than its factorization.

70515978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9070.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 70515978 is about 8397.3792340230. The cubic root of 70515978 is about 413.1386675832.

The spelling of 70515978 in words is "seventy million, five hundred fifteen thousand, nine hundred seventy-eight".