70778628 has 72 divisors (see below), whose sum is σ = 185902080. Its totient is φ = 22688640.

The previous prime is 70778627. The next prime is 70778657. The reversal of 70778628 is 82687707.

It is a super-2 number, since 2×70778628² = 10019228363124768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (70778621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116301 + ... + 116907.

Almost surely, 2^70778628 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 70778628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92951040).

70778628 is an abundant number, since it is smaller than the sum of its proper divisors (115123452).

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

70778628 is a wasteful number, since it uses less digits than its factorization.

70778628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 70778628 is about 8413.0035064773. The cubic root of 70778628 is about 413.6509695662.

The spelling of 70778628 in words is "seventy million, seven hundred seventy-eight thousand, six hundred twenty-eight".