70644990 has 32 divisors (see below), whose sum is σ = 182591136. Its totient is φ = 17389440.

The previous prime is 70644967. The next prime is 70644991. The reversal of 70644990 is 9944607.

It is a super-2 number, since 2×70644990² = 9981429224200200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70644991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90181 + ... + 90960.

It is an arithmetic number, because the mean of its divisors is an integer number (5705973).

Almost surely, 2^70644990 is an apocalyptic number.

70644990 is an abundant number, since it is smaller than the sum of its proper divisors (111946146).

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

70644990 is a wasteful number, since it uses less digits than its factorization.

70644990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181164.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 70644990 is about 8405.0574061097. The cubic root of 70644990 is about 413.3904657123.

The spelling of 70644990 in words is "seventy million, six hundred forty-four thousand, nine hundred ninety".