1636620540 has 48 divisors (see below), whose sum is σ = 4594692480. Its totient is φ = 435274560.

The previous prime is 1636620523. The next prime is 1636620547. The reversal of 1636620540 is 450266361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1636620547) 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, 13246 + ... + 58725.

It is an arithmetic number, because the mean of its divisors is an integer number (95722760).

Almost surely, 2^1636620540 is an apocalyptic number.

1636620540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1636620540 is an abundant number, since it is smaller than the sum of its proper divisors (2958071940).

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

1636620540 is a wasteful number, since it uses less digits than its factorization.

1636620540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72362 (or 72360 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 1636620540 is about 40455.1670371042. The cubic root of 1636620540 is about 1178.4631289493.

The spelling of 1636620540 in words is "one billion, six hundred thirty-six million, six hundred twenty thousand, five hundred forty".