61292440 has 32 divisors (see below), whose sum is σ = 150446160. Its totient is φ = 22288000.

The previous prime is 61292437. The next prime is 61292453. The reversal of 61292440 is 4429216.

It is a junction number, because it is equal to n+sod(n) for n = 61292399 and 61292408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69211 + ... + 70090.

Almost surely, 2^61292440 is an apocalyptic number.

It is an amenable number.

61292440 is an abundant number, since it is smaller than the sum of its proper divisors (89153720).

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

61292440 is a wasteful number, since it uses less digits than its factorization.

61292440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139323 (or 139319 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 61292440 is about 7828.9488438743. The cubic root of 61292440 is about 394.2777808688.

The spelling of 61292440 in words is "sixty-one million, two hundred ninety-two thousand, four hundred forty".