61315380 has 120 divisors (see below), whose sum is σ = 219867648. Its totient is φ = 14012352.

The previous prime is 61315369. The next prime is 61315391. The reversal of 61315380 is 8351316.

61315380 is a `hidden beast` number, since 613 + 15 + 38 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (61315369) and next prime (61315391).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8637 + ... + 14043.

Almost surely, 2^61315380 is an apocalyptic number.

61315380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61315380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109933824).

61315380 is an abundant number, since it is smaller than the sum of its proper divisors (158552268).

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

61315380 is a wasteful number, since it uses less digits than its factorization.

61315380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5435 (or 5424 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 61315380 is about 7830.4137821701. The cubic root of 61315380 is about 394.3269636833.

Adding to 61315380 its reverse (8351316), we get a palindrome (69666696).

It can be divided in two parts, 6131 and 5380, that added together give a palindrome (11511).

The spelling of 61315380 in words is "sixty-one million, three hundred fifteen thousand, three hundred eighty".