61315040 has 24 divisors (see below), whose sum is σ = 144857160. Its totient is φ = 24525952.

The previous prime is 61315013. The next prime is 61315069. The reversal of 61315040 is 4051316.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 191450 + ... + 191769.

It is an arithmetic number, because the mean of its divisors is an integer number (6035715).

Almost surely, 2^61315040 is an apocalyptic number.

It is an amenable number.

61315040 is an abundant number, since it is smaller than the sum of its proper divisors (83542120).

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

61315040 is a wasteful number, since it uses less digits than its factorization.

61315040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383234 (or 383226 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 61315040 is about 7830.3920719208. The cubic root of 61315040 is about 394.3262348210.

Adding to 61315040 its reverse (4051316), we get a palindrome (65366356).

The spelling of 61315040 in words is "sixty-one million, three hundred fifteen thousand, forty".