70305690 has 144 divisors (see below), whose sum is σ = 213293088. Its totient is φ = 14781312.

The previous prime is 70305689. The next prime is 70305707. The reversal of 70305690 is 9650307.

It is a super-2 number, since 2×70305690² = 9885780092752200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 248289 + ... + 248571.

It is an arithmetic number, because the mean of its divisors is an integer number (1481202).

Almost surely, 2^70305690 is an apocalyptic number.

70305690 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 70305690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106646544).

70305690 is an abundant number, since it is smaller than the sum of its proper divisors (142987398).

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

70305690 is a wasteful number, since it uses less digits than its factorization.

70305690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 70305690 is about 8384.8488358467. The cubic root of 70305690 is about 412.7275805708.

Adding to 70305690 its reverse (9650307), we get a palindrome (79955997).

It can be divided in two parts, 7030 and 5690, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 70305690 in words is "seventy million, three hundred five thousand, six hundred ninety".