70631890 has 32 divisors (see below), whose sum is σ = 149232384. Its totient is φ = 23561280.

The previous prime is 70631887. The next prime is 70631917. The reversal of 70631890 is 9813607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11046 + ... + 16225.

It is an arithmetic number, because the mean of its divisors is an integer number (4663512).

Almost surely, 2^70631890 is an apocalyptic number.

70631890 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

70631890 is an abundant number, since it is smaller than the sum of its proper divisors (78600494).

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

70631890 is a wasteful number, since it uses less digits than its factorization.

70631890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27322.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 70631890 is about 8404.2780772652. The cubic root of 70631890 is about 413.3649118838.

The spelling of 70631890 in words is "seventy million, six hundred thirty-one thousand, eight hundred ninety".