3478772812520 has 16 divisors (see below), whose sum is σ = 7827238828260. Its totient is φ = 1391509124992.

The previous prime is 3478772812517. The next prime is 3478772812577. The reversal of 3478772812520 is 252182778743.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2966062395076 + 512710417444 = 1722226^2 + 716038^2 .

It is a super-2 number, since 2×3478772812520² (a number of 26 digits) contains 22 as substring.

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, 43484660117 + ... + 43484660196.

Almost surely, 2^{3478772812520} is an apocalyptic number.

It is an amenable number.

3478772812520 is an abundant number, since it is smaller than the sum of its proper divisors (4348466015740).

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

3478772812520 is a wasteful number, since it uses less digits than its factorization.

3478772812520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86969320324 (or 86969320320 counting only the distinct ones).

The product of its (nonzero) digits is 10536960, while the sum is 56.

The spelling of 3478772812520 in words is "three trillion, four hundred seventy-eight billion, seven hundred seventy-two million, eight hundred twelve thousand, five hundred twenty".