1612497640 has 32 divisors (see below), whose sum is σ = 3907207080. Its totient is φ = 595383552.

The previous prime is 1612497631. The next prime is 1612497641. The reversal of 1612497640 is 467942161.

It can be written as a sum of positive squares in 4 ways, for example, as 1371813444 + 240684196 = 37038^2 + 15514^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1612497593 and 1612497602.

It is not an unprimeable number, because it can be changed into a prime (1612497641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1549959 + ... + 1550998.

Almost surely, 2^1612497640 is an apocalyptic number.

1612497640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1612497640 is an abundant number, since it is smaller than the sum of its proper divisors (2294709440).

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

1612497640 is a wasteful number, since it uses less digits than its factorization.

1612497640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100981 (or 3100977 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1612497640 is about 40155.9166250753. The cubic root of 1612497640 is about 1172.6444773570.

The spelling of 1612497640 in words is "one billion, six hundred twelve million, four hundred ninety-seven thousand, six hundred forty".