70821616 has 20 divisors (see below), whose sum is σ = 137694312. Its totient is φ = 35287616.

The previous prime is 70821593. The next prime is 70821617. The reversal of 70821616 is 61612807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70821617) 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, 2866 + ... + 12241.

Almost surely, 2^70821616 is an apocalyptic number.

It is an amenable number.

70821616 is a deficient number, since it is larger than the sum of its proper divisors (66872696).

70821616 is a wasteful number, since it uses less digits than its factorization.

70821616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15408 (or 15402 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 70821616 is about 8415.5579731828. The cubic root of 70821616 is about 413.7346974257.

The spelling of 70821616 in words is "seventy million, eight hundred twenty-one thousand, six hundred sixteen".