1525532640 has 48 divisors (see below), whose sum is σ = 4805429328. Its totient is φ = 406808576.

The previous prime is 1525532639. The next prime is 1525532641. The reversal of 1525532640 is 462355251.

It is an interprime number because it is at equal distance from previous prime (1525532639) and next prime (1525532641).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1525532641) 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, 1588617 + ... + 1589576.

It is an arithmetic number, because the mean of its divisors is an integer number (100113111).

Almost surely, 2^1525532640 is an apocalyptic number.

1525532640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1525532640 is an abundant number, since it is smaller than the sum of its proper divisors (3279896688).

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

1525532640 is a wasteful number, since it uses less digits than its factorization.

1525532640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178211 (or 3178203 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 1525532640 is about 39058.0675405223. The cubic root of 1525532640 is about 1151.1727519696.

Adding to 1525532640 its reverse (462355251), we get a palindrome (1987887891).

It can be divided in two parts, 15255 and 32640, that added together give a triangular number (47895 = T₃₀₉).

The spelling of 1525532640 in words is "one billion, five hundred twenty-five million, five hundred thirty-two thousand, six hundred forty".