70878021 has 12 divisors (see below), whose sum is σ = 96651072. Its totient is φ = 46181424.

The previous prime is 70877993. The next prime is 70878043. The reversal of 70878021 is 12087807.

It is not a de Polignac number, because 70878021 - 2⁶ = 70877957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70878091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99615 + ... + 100323.

It is an arithmetic number, because the mean of its divisors is an integer number (8054256).

Almost surely, 2^70878021 is an apocalyptic number.

It is an amenable number.

70878021 is a deficient number, since it is larger than the sum of its proper divisors (25773051).

70878021 is an frugal number, since it uses more digits than its factorization.

70878021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468 (or 759 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 70878021 is about 8418.9085397099. The cubic root of 70878021 is about 413.8445062395.

The spelling of 70878021 in words is "seventy million, eight hundred seventy-eight thousand, twenty-one".