70406820 has 168 divisors, whose sum is σ = 242383680. Its totient is φ = 17029440.

The previous prime is 70406813. The next prime is 70406839. The reversal of 70406820 is 2860407.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 160161 + ... + 160599.

It is an arithmetic number, because the mean of its divisors is an integer number (1442760).

Almost surely, 2^70406820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70406820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121191840).

70406820 is an abundant number, since it is smaller than the sum of its proper divisors (171976860).

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

70406820 is a wasteful number, since it uses less digits than its factorization.

70406820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 70406820 is about 8390.8771889475. The cubic root of 70406820 is about 412.9253793702.

The spelling of 70406820 in words is "seventy million, four hundred six thousand, eight hundred twenty".