15720440770 has 32 divisors (see below), whose sum is σ = 30526635888. Its totient is φ = 5806614528.

The previous prime is 15720440737. The next prime is 15720440797. The reversal of 15720440770 is 7704402751.

It can be written as a sum of positive squares in 8 ways, for example, as 11726074369 + 3994366401 = 108287^2 + 63201^2 .

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, 863379 + ... + 881398.

Almost surely, 2^15720440770 is an apocalyptic number.

15720440770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15720440770 is a deficient number, since it is larger than the sum of its proper divisors (14806195118).

15720440770 is a wasteful number, since it uses less digits than its factorization.

15720440770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744854.

The product of its (nonzero) digits is 54880, while the sum is 37.

It can be divided in two parts, 15720 and 440770, that added together give a triangular number (456490 = T₉₅₅).

The spelling of 15720440770 in words is "fifteen billion, seven hundred twenty million, four hundred forty thousand, seven hundred seventy".