130721650 has 48 divisors (see below), whose sum is σ = 257447808. Its totient is φ = 49280000.

The previous prime is 130721641. The next prime is 130721663. The reversal of 130721650 is 56127031.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80850 + ... + 82450.

It is an arithmetic number, because the mean of its divisors is an integer number (5363496).

Almost surely, 2^130721650 is an apocalyptic number.

130721650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

130721650 is a deficient number, since it is larger than the sum of its proper divisors (126726158).

130721650 is a wasteful number, since it uses less digits than its factorization.

130721650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707 (or 1702 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 130721650 is about 11433.3568998785. The cubic root of 130721650 is about 507.5153400364.

Adding to 130721650 its reverse (56127031), we get a palindrome (186848681).

The spelling of 130721650 in words is "one hundred thirty million, seven hundred twenty-one thousand, six hundred fifty".