70020540 has 36 divisors (see below), whose sum is σ = 212396184. Its totient is φ = 18672096.

The previous prime is 70020523. The next prime is 70020581. The reversal of 70020540 is 4502007.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194322 + ... + 194681.

It is an arithmetic number, because the mean of its divisors is an integer number (5899894).

Almost surely, 2^70020540 is an apocalyptic number.

It is an amenable number.

70020540 is an abundant number, since it is smaller than the sum of its proper divisors (142375644).

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

70020540 is a wasteful number, since it uses less digits than its factorization.

70020540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389018 (or 389013 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 70020540 is about 8367.8276750899. The cubic root of 70020540 is about 412.1688361341.

Adding to 70020540 its reverse (4502007), we get a palindrome (74522547).

The spelling of 70020540 in words is "seventy million, twenty thousand, five hundred forty".