70404390 has 96 divisors (see below), whose sum is σ = 217002240. Its totient is φ = 16088544.

The previous prime is 70404359. The next prime is 70404391. The reversal of 70404390 is 9340407.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70404391) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14941 + ... + 19079.

It is an arithmetic number, because the mean of its divisors is an integer number (2260440).

Almost surely, 2^70404390 is an apocalyptic number.

70404390 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 70404390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108501120).

70404390 is an abundant number, since it is smaller than the sum of its proper divisors (146597850).

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

70404390 is a wasteful number, since it uses less digits than its factorization.

70404390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4168 (or 4156 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 70404390 is about 8390.7323875810. The cubic root of 70404390 is about 412.9206287877.

Adding to 70404390 its reverse (9340407), we get a palindrome (79744797).

The spelling of 70404390 in words is "seventy million, four hundred four thousand, three hundred ninety".