70028388 has 90 divisors (see below), whose sum is σ = 190336146. Its totient is φ = 22450176.

The previous prime is 70028341. The next prime is 70028393. The reversal of 70028388 is 88382007.

It can be written as a sum of positive squares in 3 ways, for example, as 32353344 + 37675044 = 5688^2 + 6138^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 272356 + ... + 272612.

Almost surely, 2^70028388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70028388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95168073).

70028388 is an abundant number, since it is smaller than the sum of its proper divisors (120307758).

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

70028388 is a wasteful number, since it uses less digits than its factorization.

70028388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 70028388 is about 8368.2966008621. The cubic root of 70028388 is about 412.1842343785.

The spelling of 70028388 in words is "seventy million, twenty-eight thousand, three hundred eighty-eight".