70666820 has 36 divisors (see below), whose sum is σ = 172631340. Its totient is φ = 24228288.

The previous prime is 70666819. The next prime is 70666829. The reversal of 70666820 is 2866607.

It can be written as a sum of positive squares in 2 ways, for example, as 33918976 + 36747844 = 5824^2 + 6062^2 .

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (70666829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35075 + ... + 37034.

It is an arithmetic number, because the mean of its divisors is an integer number (4795315).

Almost surely, 2^70666820 is an apocalyptic number.

70666820 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

70666820 is an abundant number, since it is smaller than the sum of its proper divisors (101964520).

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

70666820 is a wasteful number, since it uses less digits than its factorization.

70666820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72132 (or 72123 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 70666820 is about 8406.3559287006. The cubic root of 70666820 is about 413.4330419067.

The spelling of 70666820 in words is "seventy million, six hundred sixty-six thousand, eight hundred twenty".