70721418 has 8 divisors (see below), whose sum is σ = 141442848. Its totient is φ = 23573804.

The previous prime is 70721407. The next prime is 70721419. The reversal of 70721418 is 81412707.

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

70721418 is an admirable number.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (70721419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5893446 + ... + 5893457.

It is an arithmetic number, because the mean of its divisors is an integer number (17680356).

Almost surely, 2^70721418 is an apocalyptic number.

70721418 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

70721418 is a wasteful number, since it uses less digits than its factorization.

70721418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11786908.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 70721418 is about 8409.6027254562. The cubic root of 70721418 is about 413.5394888759.

The spelling of 70721418 in words is "seventy million, seven hundred twenty-one thousand, four hundred eighteen".