61947690 has 32 divisors (see below), whose sum is σ = 169914240. Its totient is φ = 14159424.

The previous prime is 61947689. The next prime is 61947707. The reversal of 61947690 is 9674916.

It is a super-2 number, since 2×61947690² = 7675032592672200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147285 + ... + 147704.

It is an arithmetic number, because the mean of its divisors is an integer number (5309820).

Almost surely, 2^61947690 is an apocalyptic number.

61947690 is an abundant number, since it is smaller than the sum of its proper divisors (107966550).

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

61947690 is a wasteful number, since it uses less digits than its factorization.

61947690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295006.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 61947690 is about 7870.6854847593. The cubic root of 61947690 is about 395.6778192670.

The spelling of 61947690 in words is "sixty-one million, nine hundred forty-seven thousand, six hundred ninety".