70620809 has 6 divisors (see below), whose sum is σ = 82150794. Its totient is φ = 60532080.

The previous prime is 70620791. The next prime is 70620811. The reversal of 70620809 is 90802607.

It can be written as a sum of positive squares in only one way, i.e., 68227600 + 2393209 = 8260^2 + 1547^2 .

It is a de Polignac number, because none of the positive numbers 2^k-70620809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70625809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 720572 + ... + 720669.

It is an arithmetic number, because the mean of its divisors is an integer number (13691799).

Almost surely, 2^70620809 is an apocalyptic number.

It is an amenable number.

70620809 is a deficient number, since it is larger than the sum of its proper divisors (11529985).

70620809 is a wasteful number, since it uses less digits than its factorization.

70620809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441255 (or 1441248 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 70620809 is about 8403.6188038249. The cubic root of 70620809 is about 413.3432939992.

The spelling of 70620809 in words is "seventy million, six hundred twenty thousand, eight hundred nine".