164520390 has 32 divisors (see below), whose sum is σ = 418076640. Its totient is φ = 41291264.

The previous prime is 164520383. The next prime is 164520397. The reversal of 164520390 is 93025461.

164520390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (164520383) and next prime (164520397).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164520397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160785 + ... + 161804.

It is an arithmetic number, because the mean of its divisors is an integer number (13064895).

Almost surely, 2^164520390 is an apocalyptic number.

164520390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

164520390 is an abundant number, since it is smaller than the sum of its proper divisors (253556250).

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

164520390 is a wasteful number, since it uses less digits than its factorization.

164520390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322616.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 164520390 is about 12826.5501987089. The cubic root of 164520390 is about 547.9487116118.

The spelling of 164520390 in words is "one hundred sixty-four million, five hundred twenty thousand, three hundred ninety".