61557650 has 96 divisors (see below), whose sum is σ = 145704960. Its totient is φ = 18792000.

The previous prime is 61557649. The next prime is 61557653. The reversal of 61557650 is 5675516.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 61557650.

It is not an unprimeable number, because it can be changed into a prime (61557653) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 227015 + ... + 227285.

It is an arithmetic number, because the mean of its divisors is an integer number (1517760).

Almost surely, 2^61557650 is an apocalyptic number.

61557650 is an abundant number, since it is smaller than the sum of its proper divisors (84147310).

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

61557650 is a wasteful number, since it uses less digits than its factorization.

61557650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 61557650 is about 7845.8683394510. The cubic root of 61557650 is about 394.8456374892.

The spelling of 61557650 in words is "sixty-one million, five hundred fifty-seven thousand, six hundred fifty".