61649390 has 64 divisors (see below), whose sum is σ = 126904320. Its totient is φ = 21360000.

The previous prime is 61649267. The next prime is 61649431. The reversal of 61649390 is 9394616.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 344321 + ... + 344499.

It is an arithmetic number, because the mean of its divisors is an integer number (1982880).

Almost surely, 2^61649390 is an apocalyptic number.

61649390 is an abundant number, since it is smaller than the sum of its proper divisors (65254930).

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

61649390 is a wasteful number, since it uses less digits than its factorization.

61649390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 61649390 is about 7851.7125520488. The cubic root of 61649390 is about 395.0416876367.

The spelling of 61649390 in words is "sixty-one million, six hundred forty-nine thousand, three hundred ninety".