70821072 has 90 divisors (see below), whose sum is σ = 230582898. Its totient is φ = 20232576.

The previous prime is 70821029. The next prime is 70821073. The reversal of 70821072 is 27012807.

It can be written as a sum of positive squares in only one way, i.e., 55890576 + 14930496 = 7476^2 + 3864^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70821073) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2038 + ... + 12074.

Almost surely, 2^70821072 is an apocalyptic number.

70821072 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70821072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115291449).

70821072 is an abundant number, since it is smaller than the sum of its proper divisors (159761826).

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

70821072 is a wasteful number, since it uses less digits than its factorization.

70821072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10065 (or 10049 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 70821072 is about 8415.5256520315. The cubic root of 70821072 is about 413.7336380869.

Adding to 70821072 its reverse (27012807), we get a palindrome (97833879).

The spelling of 70821072 in words is "seventy million, eight hundred twenty-one thousand, seventy-two".