1651633890 has 64 divisors (see below), whose sum is σ = 4000776192. Its totient is φ = 436363200.

The previous prime is 1651633883. The next prime is 1651633891. The reversal of 1651633890 is 983361561.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1651633891) 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 31 ways as a sum of consecutive naturals, for example, 1812535 + ... + 1813445.

It is an arithmetic number, because the mean of its divisors is an integer number (62512128).

Almost surely, 2^1651633890 is an apocalyptic number.

1651633890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1651633890 is an abundant number, since it is smaller than the sum of its proper divisors (2349142302).

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

1651633890 is a wasteful number, since it uses less digits than its factorization.

1651633890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 1651633890 is about 40640.2988424052. The cubic root of 1651633890 is about 1182.0556645920.

The spelling of 1651633890 in words is "one billion, six hundred fifty-one million, six hundred thirty-three thousand, eight hundred ninety".