1545607540 has 12 divisors (see below), whose sum is σ = 3245775876. Its totient is φ = 618243008.

The previous prime is 1545607537. The next prime is 1545607543. The reversal of 1545607540 is 457065451.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1545607537) and next prime (1545607543).

It can be written as a sum of positive squares in 2 ways, for example, as 1210204944 + 335402596 = 34788^2 + 18314^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1545607540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1545607543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38640169 + ... + 38640208.

It is an arithmetic number, because the mean of its divisors is an integer number (270481323).

Almost surely, 2^1545607540 is an apocalyptic number.

1545607540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1545607540 is an abundant number, since it is smaller than the sum of its proper divisors (1700168336).

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

1545607540 is a wasteful number, since it uses less digits than its factorization.

1545607540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77280386 (or 77280384 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 37.

The square root of 1545607540 is about 39314.2154951615. The cubic root of 1545607540 is about 1156.2002951509.

The spelling of 1545607540 in words is "one billion, five hundred forty-five million, six hundred seven thousand, five hundred forty".