70855890 has 64 divisors (see below), whose sum is σ = 196853760. Its totient is φ = 15986880.

The previous prime is 70855879. The next prime is 70855891. The reversal of 70855890 is 9855807.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (70855891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14455 + ... + 18725.

It is an arithmetic number, because the mean of its divisors is an integer number (3075840).

Almost surely, 2^70855890 is an apocalyptic number.

70855890 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 70855890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98426880).

70855890 is an abundant number, since it is smaller than the sum of its proper divisors (125997870).

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

70855890 is a wasteful number, since it uses less digits than its factorization.

70855890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4367.

The product of its (nonzero) digits is 100800, while the sum is 42.

The square root of 70855890 is about 8417.5940743184. The cubic root of 70855890 is about 413.8014287286.

The spelling of 70855890 in words is "seventy million, eight hundred fifty-five thousand, eight hundred ninety".