70521420 has 48 divisors (see below), whose sum is σ = 198319968. Its totient is φ = 18723840.

The previous prime is 70521413. The next prime is 70521439. The reversal of 70521420 is 2412507.

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, 12022 + ... + 16898.

It is an arithmetic number, because the mean of its divisors is an integer number (4131666).

Almost surely, 2^70521420 is an apocalyptic number.

It is an amenable number.

70521420 is an abundant number, since it is smaller than the sum of its proper divisors (127798548).

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

70521420 is a wasteful number, since it uses less digits than its factorization.

70521420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5130 (or 5128 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 70521420 is about 8397.7032574389. The cubic root of 70521420 is about 413.1492951641.

Adding to 70521420 its reverse (2412507), we get a palindrome (72933927).

The spelling of 70521420 in words is "seventy million, five hundred twenty-one thousand, four hundred twenty".