15491642040 has 240 divisors, whose sum is σ = 60570833400. Its totient is φ = 3540910464.

The previous prime is 15491642029. The next prime is 15491642041. The reversal of 15491642040 is 4024619451.

15491642040 is a `hidden beast` number, since 1 + 5 + 4 + 9 + 1 + 642 + 0 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 15491641986 and 15491642004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15491642041) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 109971 + ... + 207549.

Almost surely, 2^15491642040 is an apocalyptic number.

15491642040 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 15491642040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30285416700).

15491642040 is an abundant number, since it is smaller than the sum of its proper divisors (45079191360).

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

15491642040 is a wasteful number, since it uses less digits than its factorization.

15491642040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97616 (or 97596 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 15491642040 in words is "fifteen billion, four hundred ninety-one million, six hundred forty-two thousand, forty".