15490640 has 80 divisors (see below), whose sum is σ = 40711680. Its totient is φ = 5429760.

The previous prime is 15490639. The next prime is 15490663. The reversal of 15490640 is 4609451.

15490640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25217 + ... + 25823.

It is an arithmetic number, because the mean of its divisors is an integer number (508896).

Almost surely, 2^15490640 is an apocalyptic number.

15490640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15490640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20355840).

15490640 is an abundant number, since it is smaller than the sum of its proper divisors (25221040).

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

15490640 is a wasteful number, since it uses less digits than its factorization.

15490640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 15490640 is about 3935.8150363044. The cubic root of 15490640 is about 249.2813494785.

The spelling of 15490640 in words is "fifteen million, four hundred ninety thousand, six hundred forty".