15420612440 has 16 divisors (see below), whose sum is σ = 34696378080. Its totient is φ = 6168244960.

The previous prime is 15420612419. The next prime is 15420612517. The reversal of 15420612440 is 4421602451.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192757616 + ... + 192757695.

It is an arithmetic number, because the mean of its divisors is an integer number (2168523630).

Almost surely, 2^15420612440 is an apocalyptic number.

15420612440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15420612440 is an abundant number, since it is smaller than the sum of its proper divisors (19275765640).

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

15420612440 is a wasteful number, since it uses less digits than its factorization.

15420612440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385515322 (or 385515318 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The spelling of 15420612440 in words is "fifteen billion, four hundred twenty million, six hundred twelve thousand, four hundred forty".