1623533640 has 64 divisors (see below), whose sum is σ = 4874333760. Its totient is φ = 432610560.

The previous prime is 1623533599. The next prime is 1623533647. The reversal of 1623533640 is 463353261.

It is a super-2 number, since 2×1623533640² = 5271722960423299200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1623533647) 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, 179302 + ... + 188138.

It is an arithmetic number, because the mean of its divisors is an integer number (76161465).

Almost surely, 2^1623533640 is an apocalyptic number.

1623533640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1623533640 is an abundant number, since it is smaller than the sum of its proper divisors (3250800120).

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

1623533640 is a wasteful number, since it uses less digits than its factorization.

1623533640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10382 (or 10378 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 33.

The square root of 1623533640 is about 40293.0966792080. The cubic root of 1623533640 is about 1175.3136063472.

The spelling of 1623533640 in words is "one billion, six hundred twenty-three million, five hundred thirty-three thousand, six hundred forty".