61538480 has 20 divisors (see below), whose sum is σ = 143077152. Its totient is φ = 24615360.

The previous prime is 61538479. The next prime is 61538507. The reversal of 61538480 is 8483516.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 61538480.

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, 384536 + ... + 384695.

Almost surely, 2^61538480 is an apocalyptic number.

It is an amenable number.

61538480 is an abundant number, since it is smaller than the sum of its proper divisors (81538672).

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

61538480 is a wasteful number, since it uses less digits than its factorization.

61538480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769244 (or 769238 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 61538480 is about 7844.6465822241. The cubic root of 61538480 is about 394.8046462302.

The spelling of 61538480 in words is "sixty-one million, five hundred thirty-eight thousand, four hundred eighty".