1648831740 has 48 divisors (see below), whose sum is σ = 4741511712. Its totient is φ = 427804416.

The previous prime is 1648831739. The next prime is 1648831747. The reversal of 1648831740 is 471388461.

It is a super-2 number, since 2×1648831740² = 5437292213662855200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1648831692 and 1648831701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1648831747) 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, 369139 + ... + 373578.

It is an arithmetic number, because the mean of its divisors is an integer number (98781494).

Almost surely, 2^1648831740 is an apocalyptic number.

1648831740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1648831740 is an abundant number, since it is smaller than the sum of its proper divisors (3092679972).

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

1648831740 is a wasteful number, since it uses less digits than its factorization.

1648831740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742766 (or 742764 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 1648831740 is about 40605.8091903117. The cubic root of 1648831740 is about 1181.3867971805.

The spelling of 1648831740 in words is "one billion, six hundred forty-eight million, eight hundred thirty-one thousand, seven hundred forty".