61370640 has 60 divisors (see below), whose sum is σ = 206105484. Its totient is φ = 16365312.

The previous prime is 61370623. The next prime is 61370651. The reversal of 61370640 is 4607316.

61370640 is a `hidden beast` number, since 6 + 13 + 7 + 0 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 32080896 + 29289744 = 5664^2 + 5412^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41899 + ... + 43338.

Almost surely, 2^61370640 is an apocalyptic number.

61370640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61370640 is an abundant number, since it is smaller than the sum of its proper divisors (144734844).

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

61370640 is a wasteful number, since it uses less digits than its factorization.

61370640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85256 (or 85247 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 61370640 is about 7833.9415366723. The cubic root of 61370640 is about 394.4453894634.

Adding to 61370640 its reverse (4607316), we get a palindrome (65977956).

It can be divided in two parts, 613 and 70640, that added together give a triangular number (71253 = T₃₇₇).

The spelling of 61370640 in words is "sixty-one million, three hundred seventy thousand, six hundred forty".