61720994 has 4 divisors (see below), whose sum is σ = 92581494. Its totient is φ = 30860496.

The previous prime is 61720993. The next prime is 61721017. The reversal of 61720994 is 49902716.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 39753025 + 21967969 = 6305^2 + 4687^2 .

It is a super-2 number, since 2×61720994² = 7618962200696072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61720993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15430247 + ... + 15430250.

Almost surely, 2^61720994 is an apocalyptic number.

61720994 is a deficient number, since it is larger than the sum of its proper divisors (30860500).

61720994 is a wasteful number, since it uses less digits than its factorization.

61720994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30860499.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 61720994 is about 7856.2709983808. The cubic root of 61720994 is about 395.1945716621.

The spelling of 61720994 in words is "sixty-one million, seven hundred twenty thousand, nine hundred ninety-four".