61487994 has 16 divisors (see below), whose sum is σ = 123916320. Its totient is φ = 20339280.

The previous prime is 61487989. The next prime is 61487999. The reversal of 61487994 is 49978416.

It is an interprime number because it is at equal distance from previous prime (61487989) and next prime (61487999).

It is a super-2 number, since 2×61487994² = 7561546812288072, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61487999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38329 + ... + 39900.

It is an arithmetic number, because the mean of its divisors is an integer number (7744770).

Almost surely, 2^61487994 is an apocalyptic number.

61487994 is an abundant number, since it is smaller than the sum of its proper divisors (62428326).

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

61487994 is a wasteful number, since it uses less digits than its factorization.

61487994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78365.

The product of its digits is 435456, while the sum is 48.

The square root of 61487994 is about 7841.4280587148. The cubic root of 61487994 is about 394.6966511426.

It can be divided in two parts, 61487 and 994, that added together give a triangular number (62481 = T₃₅₃).

The spelling of 61487994 in words is "sixty-one million, four hundred eighty-seven thousand, nine hundred ninety-four".