1650640780 has 12 divisors (see below), whose sum is σ = 3466345680. Its totient is φ = 660256304.

The previous prime is 1650640777. The next prime is 1650640807. The reversal of 1650640780 is 870460561.

It is a super-2 number, since 2×1650640780² = 5449229969198016800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41266000 + ... + 41266039.

It is an arithmetic number, because the mean of its divisors is an integer number (288862140).

Almost surely, 2^1650640780 is an apocalyptic number.

1650640780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1650640780 is an abundant number, since it is smaller than the sum of its proper divisors (1815704900).

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

1650640780 is a wasteful number, since it uses less digits than its factorization.

1650640780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82532048 (or 82532046 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1650640780 is about 40628.0787141110. The cubic root of 1650640780 is about 1181.8186978983.

The spelling of 1650640780 in words is "one billion, six hundred fifty million, six hundred forty thousand, seven hundred eighty".