168621490 has 16 divisors (see below), whose sum is σ = 310578048. Its totient is φ = 65879856.

The previous prime is 168621473. The next prime is 168621491. The reversal of 168621490 is 94126861.

It is a happy number.

168621490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (168621491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195642 + ... + 196501.

It is an arithmetic number, because the mean of its divisors is an integer number (19411128).

Almost surely, 2^168621490 is an apocalyptic number.

168621490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168621490 is a deficient number, since it is larger than the sum of its proper divisors (141956558).

168621490 is a wasteful number, since it uses less digits than its factorization.

168621490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392193.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 168621490 is about 12985.4337624894. The cubic root of 168621490 is about 552.4644121683.

The spelling of 168621490 in words is "one hundred sixty-eight million, six hundred twenty-one thousand, four hundred ninety".