70820820 has 72 divisors (see below), whose sum is σ = 245516544. Its totient is φ = 16187328.

The previous prime is 70820819. The next prime is 70820821. The reversal of 70820820 is 2802807.

It is an interprime number because it is at equal distance from previous prime (70820819) and next prime (70820821).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70820821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26844 + ... + 29363.

It is an arithmetic number, because the mean of its divisors is an integer number (3409952).

Almost surely, 2^70820820 is an apocalyptic number.

70820820 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

70820820 is an abundant number, since it is smaller than the sum of its proper divisors (174695724).

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

70820820 is a wasteful number, since it uses less digits than its factorization.

70820820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56229 (or 56224 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 70820820 is about 8415.5106796914. The cubic root of 70820820 is about 413.7331473620.

It can be divided in two parts, 708 and 20820, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 70820820 in words is "seventy million, eight hundred twenty thousand, eight hundred twenty".