70423440 has 40 divisors (see below), whose sum is σ = 218313408. Its totient is φ = 18779520.

The previous prime is 70423439. The next prime is 70423453. The reversal of 70423440 is 4432407.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 70423440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146476 + ... + 146955.

Almost surely, 2^70423440 is an apocalyptic number.

It is an amenable number.

70423440 is an abundant number, since it is smaller than the sum of its proper divisors (147889968).

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

70423440 is a wasteful number, since it uses less digits than its factorization.

70423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293447 (or 293441 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 70423440 is about 8391.8674918042. The cubic root of 70423440 is about 412.9578680783.

Adding to 70423440 its reverse (4432407), we get a palindrome (74855847).

The spelling of 70423440 in words is "seventy million, four hundred twenty-three thousand, four hundred forty".