70821916 has 12 divisors (see below), whose sum is σ = 135205560. Its totient is φ = 32191760.

The previous prime is 70821893. The next prime is 70821937. The reversal of 70821916 is 61912807.

It is a happy number.

It is a super-2 number, since 2×70821916² = 10031487571822112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 804751 + ... + 804838.

It is an arithmetic number, because the mean of its divisors is an integer number (11267130).

Almost surely, 2^70821916 is an apocalyptic number.

It is an amenable number.

70821916 is a deficient number, since it is larger than the sum of its proper divisors (64383644).

70821916 is a wasteful number, since it uses less digits than its factorization.

70821916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609604 (or 1609602 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 70821916 is about 8415.5757972940. The cubic root of 70821916 is about 413.7352816176.

It can be divided in two parts, 7082 and 1916, that added together give a palindrome (8998).

The spelling of 70821916 in words is "seventy million, eight hundred twenty-one thousand, nine hundred sixteen".