61379955 has 72 divisors (see below), whose sum is σ = 131777568. Its totient is φ = 25878528.

The previous prime is 61379917. The next prime is 61379957. The reversal of 61379955 is 55997316.

61379955 = 116² + 117² + ... + 570².

It is not a de Polignac number, because 61379955 - 2⁶ = 61379891 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 61379955.

It is not an unprimeable number, because it can be changed into a prime (61379957) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 52659 + ... + 53811.

It is an arithmetic number, because the mean of its divisors is an integer number (1830244).

Almost surely, 2^61379955 is an apocalyptic number.

61379955 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61379955 is an abundant number, since it is smaller than the sum of its proper divisors (70397613).

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

61379955 is a wasteful number, since it uses less digits than its factorization.

61379955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197 (or 1181 counting only the distinct ones).

The product of its digits is 255150, while the sum is 45.

The square root of 61379955 is about 7834.5360424214. The cubic root of 61379955 is about 394.4653451128.

The spelling of 61379955 in words is "sixty-one million, three hundred seventy-nine thousand, nine hundred fifty-five".