15345720 has 128 divisors (see below), whose sum is σ = 55137600. Its totient is φ = 3773952.

The previous prime is 15345719. The next prime is 15345721. The reversal of 15345720 is 2754351.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (15345719) and next prime (15345721).

It is a super-2 number, since 2×15345720² = 470982244636800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15345721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13494 + ... + 14586.

Almost surely, 2^15345720 is an apocalyptic number.

15345720 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 15345720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27568800).

15345720 is an abundant number, since it is smaller than the sum of its proper divisors (39791880).

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

15345720 is a wasteful number, since it uses less digits than its factorization.

15345720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126 (or 1116 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 15345720 is about 3917.3613568319. The cubic root of 15345720 is about 248.5015431191.

The spelling of 15345720 in words is "fifteen million, three hundred forty-five thousand, seven hundred twenty".